Whilst often written in 3/4 or 6/4, it is not a jazz waltz, since the feel alternates between simple meter and compound meter. On Miles Smiles (Miles Davis), the band playfully explores the correlation between African-based 12/8 (or 6/8), and 4/4. Drummer Tony Williams freely moves from swing, to the three-over-two cross rhythm—and to its 4/4 correlative. The ground of four main beats is maintained throughout the piece. The bass switches to 4/4 at 2:20. Carter’s 4/4 figure is known as "tresillo" in Afro-Cuban music and is the duple-pulse correlative of the 12/8 figure. This may have been the first overt expression of systemic, African-based cross-rhythm used by a straight ahead jazz group. During Davis’s first trumpet solo, Williams shifts to a 4/4 jazz ride pattern while Carter continues the 12/8 bass line. The following example shows the 12/8 and 4/4 forms of the bass line. The slashed noteheads indicate the main beats (not bass notes), where one ordinarily taps their foot to "keep time."
"Footprints" bass lines, with main beats indicated by slashed noteheads.
Harmonically, it takes the form of a 12-bar C minorblues, but this is heavily masked not only by its triple time signature but by its avant gardeturnaround (series of chords that return to the main, or I chord). In the key of C minor, a normal turnaround would be Dm7(♭5), G7, Cm7. But Shorter doubles the harmonic rhythm of the turnaround, and the progression reads: F♯m7♭5, F7♯11, Eaug7(♯9), A7(♯9), Cm7. In jazz jam sessions and for educational pusposes players often choose D7♯11 Db7♯11 Cm7 as turnaround, which also fits with the original melody. Although, having a C minor feel, the melody is actually in C Dorian, because of the A natural rather than A flat.