Hey acman3 that Rollins Live at the Village Vanguard 2 disc set features Sonny in a trio setting sans piano. Sonny loved to play without a piano player and has many recording sessions without piano.
Also of note on that "Night at the Village Vanguard" is the complete sessions had an afternoon set with Donald Bailey and Pete LaRoca on bass and drums and the 2 evening/night sessions featured Wilbur Ware and Elvin Jones bass and drums
Sonny's great Way Out West studio session also was in a trio format sans piano, with Ray Brown on bass and Shelly Manne on drums.
The music employs a technique called "strolling", used here by Rollins for the first time, in which he would solo over only bass and drums with no pianist or guitarist playing chords.

