Interplay is a medium minor blues, and one of Bill Evans' earlier compositions, and this arrangement utilizes elements of the arrangement on his album of the same name. There is much additional material as well. The bass trombone is featured both in written and improvised solos, and the third trombone has an extended solo as well. Both the bassist and drummer have short solo sections with ensemble sendoffs. Difficult. Scored for 5 tenor bones, 1 bass bone and rhythm.