Ad Lib Blues is a collaborative composition credited to Oscar Peterson and Lester Young, created for a 1952 studio session produced by Norman Granz for Norgran Records. The piece was recorded with Young on tenor saxophone backed by Peterson on piano, Barney Kessel on guitar, Ray Brown on bass, and J.C. Heard on drums, appearing as the opening track on the compiled album Lester Young with the Oscar Peterson Trio (also reissued as The President Plays with the Oscar Peterson Trio). As the title suggests, the tune is built around an ad lib, improvisatory approach to the blues, emphasizing spontaneous interplay between Young's relaxed, melodic tenor and Peterson's supportive, rhythmically inventive piano. The composition reflects the collaborative small-group recording practices of the early 1950s, when Granz frequently paired major soloists with top-tier rhythm sections for intimate studio dates. For Young, the piece exemplifies his post-Basie aesthetic of understated, lyrical blues playing, while for Peterson it represents an early collaborative original during his rising prominence as an accompanist to jazz's leading voices. Ad Lib Blues remains closely associated with this single recording session and has not entered the broader jazz repertoire as a commonly performed standard, making it a notable deep cut from one of the most respected tenor saxophone and piano trio collaborations of the era.
