Marsh's expansive liner notes observe that the song "East-West" "was an exploration of music that moved modally, rather than through chord changes. As Naftalin explains, "The song was based, like Indian music, on a drone. In Western musical terms, it 'stayed on the one'. The song was tethered to a four-beat bass pattern and structured as a series of sections, each with a different mood, mode and color, always underscored by the drummer, who contributed not only the rhythmic feel but much in the way of tonal shading, using mallets as well as sticks on the various drums and the different regions of the cymbals. In addition to playing beautiful solos, Paul played important, unifying things [on harmonica in the background - chords, melodies, counterpoints, counter-rhythms. This was a group improvisation. In its fullest form it lasted over an hour."