The short answer is that one will fall short of telling the truth. Obviously, compare the core melodic and rhythmic patterns — not the production, key, or tempo — against your reference songs. If the resemblance survives once you strip away the more presentational elements, you might get a professional similarity analysis before release.
If you’re asking this question, something triggered it. Maybe someone told you your track sounds like another song. (Isn’t that the worst?) Maybe you heard the resemblance yourself and now you can’t unhear it. Maybe, and there’s nothing wrong with this, you set out to write something kinda like another song, the way Pharrell and Thicke did. Either way, you’re right to take it seriously — melodic similarity, lyrical similarity, even chord progression similarity — the earlier you assess it, the more options you have.
The most obvious starting point is critical listening — compare the two tracks side by side and listen for overlap of any kind. Courts actually care whether an ordinary listener perceives substantial similarity between the works. But it alone won’t tell you what’s creating that impression, whether it’s legally significant, or how exposed you are. The analysis needs to go deeper, because not everything that sounds alike is protectable, and not everything that’s protectable sounds obviously alike, especially to untrained ears.
You then go deeper — looking for distinctive melodic and rhythmic patterns that give your work its identity, beginning with the sort of elements a listener latches onto, hums back, and recognizes. And then, within that, discount the ornamentation, the production, the key, and the tempo. Reduce elements, like the melody, to their essential structure, and compare what’s left. And then, if the resemblance survives some of that reduction work, consider that you might be in territory worth examining carefully.
This page could just as easily have begun, “Call a forensic musicologist.” And that would be valid, but less fun and not helpful. The catch is that “reduce the elements to their essential structure” is doing enormous work in there. It’s a forensic skill set, not an intuition, even in musicians in my experience. And getting it wrong in either direction has real consequences. Overcall it and you change a hook that didn’t need changing. Undercall it and you release something that draws a claim. So, this page will help you understand what’s actually at stake and how to think about your risk more clearly.
For a detailed look at how the full forensic process works, see Song Similarity Analysis.
Two Copyrights, One Song — And Most People Only Think About One
This trips up nearly everyone who isn’t deep in music law: every commercially released track involves two separate copyrights. The Sound Recording — the actual audio, the master, the specific performance captured in the file — and the Musical Work — the underlying composition — the melody, lyrics, harmony, rhythm, form, as written. That’s the song. The former is the presentation of the song, like Sinatra singing standards. The standard is the song; the Musical Work; Sinatra makes a recording of it, even though he and everyone involved make lots of creative choices along the way.
They’re legally distinct; owned differently, registered differently, licensed differently, and infringed upon differently. When you worry for cause that your song “sounds like” another song, you’re almost certainly worried about the Musical Work — the compositional overlap. But most of the tools people reach for (Shazam, audio fingerprinting, AI matching services) operate on the Sound Recording side. They’re comparing audio waveforms, not analyzing melodic structure. And a clean result from a recognition app tells you about masters that don’t match. And that was probably not the question.
It comes up all the time though. It’s very often the first thing a forensic musicologist sorts out when the phone rings, and we’re evaluating a potential claim. Are we talking about a production that sounds similar, or a composition that’s substantially similar? Different problems with different risk profiles and different solutions.
Why Similarity Is Harder to Assess Than You Think
You can hear that two songs sound alike. You’re right, they do, otherwise we’re not having this conversation. I never tell a client the two songs don’t sound alike. The hard part is determining whether what sounds alike is protectable.
Music is full of shared vocabulary. Chord progressions, like the I–V–vi–IV that the Axis of Awesome made famous, appear in more than their share of hits. Certain melodic fragments are so common they function as musical idioms — pentatonics, bluesy things, intervallic clichés, rhythmic patterns that recur constantly across genres — none of this belongs to anyone.
Protectable expression emerges largely from how these common elements combine. “Endless possibilities within fairly confined probabilities,” as I often say — like, a particular melodic contour landing on specific pitches with its specific rhythmic placements, and at a specific point in its phrase. This starts to become someone’s original work. When that’s the overlap — your melody does something recognizably similar at the same structural moment (just one way of looking at it, mind you) — your overlap can start to be very concerning.
There’s no clear line, especially not one a non-professional can draw.
A Few Things That Won’t Protect You
In short, trying to get away with something won’t protect you. A lot of songwriters reassure themselves with fixes that don’t actually fix anything. Changing the key doesn’t help. Changing the tempo doesn’t help. Changing the time signature probably doesn’t help. A cheeseburger is still a cheeseburger whether you serve it hot or cold, square or round, with or without onions. Not the perfect metaphor. Nobody is suing you for stealing their cheeseburger recipe. But if the melodic shape and rhythmic profile are recognizably the same after transposition, you haven’t changed anything that matters. You’ve changed the presentation of the same underlying expression.
Adding to and subtracting from a song you’re modeling after doesn’t work either. In fact, if your process is starting with an existing song and turning it into your own, you’re on shaky ground from the get-go. Adding around the problematic similarity or deleting some of it generally doesn’t help much either.
And pleading ignorance is no silver bullet. Simply being unaware of your reference song — you didn’t mean to copy — doesn’t help as much as people might assume. Independent creation is a defense, so that can be confusing — but if you had reasonable access to the prior work (and “reasonable access” is a pretty low bar), a plaintiff can argue that subconscious copying occurred. Courts have recognized this theory since the George Harrison “My Sweet Lord” case in the 1970s, and it comes up regularly. Has a cute name — cryptomnesia. Look it up.
A music copyright clearance analysis can help determine whether similarities pose a legal risk.
Frequently Asked Questions About Song Similarity and Copyright
Q: Does my song have to be identical to infringe?
A: No. The legal standard is substantial similarity of protectable expression — not note-for-note identity. You don’t need a 100% match to have a problem.
Q: Can I avoid infringement by changing the key, tempo, or time signature?
A: Probably not. Transposition and tempo are largely presentational. A cheeseburger is still a cheeseburger whether you serve it hot or cold, square or round, with or without onions. Not the perfect metaphor. Nobody is suing you for stealing their cheeseburger recipe. But if the melodic shape and rhythmic profile are recognizably the same after the change, you likely haven’t changed anything that matters. You’ve changed the presentation of the same underlying expression.
Q: Shazam says no match — am I clear?
A: No. Recognition apps identify Sound Recordings — audio fingerprints of a specific master. They tell you nothing about the underlying Musical Work, which is an entirely separate copyright. Different analysis, different question.
Q: Can chords or groove create an infringement problem?
A: Simple chord progressions are generally unprotectable on their own. But unprotectable elements can be part of a selection and arrangement argument — how individually common elements combine into something distinctive. A recognizable melody over a shared harmonic framework can make the similarity more conspicuous.
Q: I never heard the other song — can I still be infringing?
A: Possibly. Independent creation is a defense, but reasonable access plus substantial similarity can support a claim of subconscious copying — cryptomnesia. Courts have recognized this since the 1970s. Copyright infringement is essentially a strict liability matter — intent doesn’t determine infringement.
Q: What if I added enough original material around the similar part?
A: Neither adding to nor subtracting from something preexisting is an advised strategy. If your chorus is substantially similar to someone else’s, an original verse is unlikely to cure it. And if your melody is the same string of many notes in a row, depending upon the notes of course, erasing a couple is also not a cure-all.
If it were simple, I’d tell you.
Moving on…
Gut Check (And Its Limits)
Courts consider what’s called the “ordinary observer” or “ordinary listener” test — the idea that substantial similarity should be apparent to a reasonable person, not just a trained analyst. Juries are ordinary observers. If untrained ears hear the connection without prompting, that’s meaningful, and forensic musicologists deal with layperson observations and claims all day.
But when Musicologize does a clearance analysis, every manner of risk is on the table, because it’s all real risk. A forensic musicologist may opine, “This similarity shouldn’t warrant a winning claim,” but my analysis considers soft risk as well — the kind that doesn’t win in court but still triggers takedowns, stalls releases, and costs you money and time to resolve. There are also legal conventions worth considering, while to be clear, forensic musicology is distinct from legality, and only attorneys should give legal advice.
Best Practice: Build a Moat, Not a Line
Copyright risk is a spectrum, not a switch. So adopt the right approach. The goal isn’t to be different enough to survive a challenge — it’s to be original; to create clear space between your work and anyone else’s protectable expression. Compared to that other work, yours is independently generated, not merely altered.
If there’s something about the other song that you borrowed, and you’re loath to let it go, hire a musicologist and get an analysis. But also, while we see if you should retain that element, go write more music around it and create space. That’s often the best advice I give.
When someone says, “What should I change about this element?” often my answer is, “Don’t change it; write something else there.” Of course, we’re being very general. When it’s a musicology engagement, I’m prescriptive with motif shapes, rhythmic profiles, where phrases begin and end, how they develop. But for now, for here, think of it less as “changing your song” and more as ensuring your song is actually yours — that it stands on its own compositional identity rather than leaning on someone else’s.
When you need to document that independence for a label, library, or sync partner, a Clearance Letter from Musicologize is a standard deliverable.
When to Call a Musicologist
Sometimes that’s the move. If you hear a resemblance and it won’t go away — even after you’ve thought hard about it — that’s a signal. If a collaborator, label, or music supervisor flags it, that’s a stronger one — that’s some real gravity. If you’ve received a takedown notice or an actual infringement claim, you’re past the preemptive stage, but not necessarily all the way to the “I should panic” phase.
I’m not a lawyer and I don’t give legal advice. Lawyers handle legal strategy, but they aren’t music analysts. They rely on musicologists to provide the forensic opinions those strategies are built on. Most attorneys will tell you to get the musicological analysis as the first step after registering your copyright.
What that looks like: an independent comparative breakdown of melody, rhythm, harmony, and structure; context on whether the shared elements are distinctive expression or common musical vocabulary that belongs to everyone; and a clear call — keep it, revise it, or replace it. If needed, a formal clearance letter. Our process overview covers what the analysis involves.
Concerned about samples or loop-based sound-alikes? That’s different from what we discussed here, but we do that too.
Next Steps
If you want clarity before release, request a clearance analysis. The initial call is free. Email brianmcbrearty@gmail.com or call (212) 217-9512.