What did Swirsky v. Carey decide?

The Ninth Circuit reversed a grant of summary judgment for Mariah Carey and held that the extrinsic test for musical copyright requires objective analysis of all relevant musical elements — melody, harmony, rhythm, pitch, tempo, and structure. A plaintiff who produces expert testimony identifying genuine similarities in these elements survives summary judgment.

What is the extrinsic test for music copyright in the Ninth Circuit?

The extrinsic test is the first step of the Ninth Circuit's two-part substantial similarity analysis. It is objective: it asks whether the works share similarities in measurable, identifiable musical elements, including melody, harmony, rhythm, pitch, tempo, and structure. If the extrinsic test is met, the intrinsic test — whether an ordinary listener would find the works substantially similar — goes to the jury.

Why do Ninth Circuit music copyright cases require a musicologist expert?

Swirsky v. Carey established that satisfying the extrinsic test requires technical analysis of objective musical elements. Courts cannot perform this analysis independently, and they cannot weigh competing expert conclusions at summary judgment. A plaintiff with a qualified musicologist expert testifying to similarity in these elements has satisfied the minimum threshold to reach a jury.

What musical elements does the Ninth Circuit examine in copyright cases?

Under Swirsky v. Carey, the extrinsic test covers melody, harmony, rhythm, pitch, tempo, and structure. Genre conventions, standard chord progressions in the abstract, and common stylistic features must be filtered out before comparing what remains of the protected expression.

Swirsky v. Carey Musicologize

In Swirsky v. Carey, 376 F.3d 841 (9th Cir. 2004), the Ninth Circuit reversed a grant of summary judgment for the defendants and held that a plaintiff in a music copyright case survives summary judgment when a musicologist expert identifies genuine similarities in the objective musical elements of the works — melody, harmony, rhythm, pitch, tempo, and structure. The district court had dismissed the case. The Ninth Circuit said that was wrong.

The works at issue were Seth Swirsky’s “One of Those Love Songs” and the Mariah Carey hit “Thank God I Found You,” written by Carey, Jermaine Dupri, and Manuel Seal. Swirsky alleged that the melody, chord progression, and compositional structure of his song had been copied into Carey’s record. The district court reviewed the competing expert opinions and concluded that no reasonable jury could find substantial similarity. The Ninth Circuit identified a fundamental error in that analysis.

The error was this: the district court weighed the experts against each other and selected a winner. That is not what courts do at summary judgment. When a plaintiff produces expert testimony identifying similarities in the objective musical elements — the technical, measurable components of a composition — that testimony creates a genuine dispute of material fact. Choosing between dueling experts is the jury’s function, not the court’s.

What the extrinsic test actually requires

The Ninth Circuit applies a two-step substantial similarity analysis. The first step, the extrinsic test, is objective. It asks whether the works share similarities in identifiable, measurable musical elements. The second step, the intrinsic test, is subjective. It asks whether an ordinary listener would find the overall impression of the works substantially similar. The extrinsic step is for the court; the intrinsic step is for the jury.

Swirsky answered what the extrinsic test requires for music with precision. The test covers the full technical palette: melody, harmony, rhythm, pitch, tempo, and structure. If a musicologist’s expert report identifies genuine similarities in these elements — not just similarities in feel or genre — then the extrinsic test is satisfied and the case proceeds to a jury.

What the expert must actually do

What Swirsky established is that a credible musicologist expert report is the minimum threshold for surviving summary judgment in the Ninth Circuit. The report cannot merely assert that the songs “sound alike.” It must analyze melody note by note, document harmonic structure, compare rhythmic patterns, and assess pitch relationships and compositional form. When that work is done rigorously, summary judgment is not available to the defendant.

The flip side: the extrinsic test is not satisfied by showing that two songs are in the same genre, share a similar mood, or use comparable instrumentation. Genre conventions, common chord progressions in isolation, and standard song structures are not copyrightable. The extrinsic test asks about the specific, protected expression — what this songwriter chose to combine, sequence, and deploy. Filtering out the unprotectable elements before comparing what remains is the core technical task.

That filtration task is where forensic musicology operates. The analysis proceeds through layers. What in this melody is generic to the genre, and what is specifically this composer’s choice of pitch sequence? What in this harmonic structure is standard pop harmony, and what is a particular progression of intervals selected from among many alternatives? The answers require musical training, genre knowledge, and the ability to draw meaningful distinctions between protected expression and unprotectable material.

The musical analysis is mine. Legal advice is your attorney’s.