Oliver Edward Nelson was an American jazz saxophonist, clarinetist, arranger, composer, and bandleader. His 1961 Impulse! album The Blues and the Abstract Truth (1961) is regarded as one of the most significant recordings of its era. The centerpiece of the album is the definitive version of Nelson's composition, "Stolen Moments". Other important recordings from the 1960s are the albums More Blues and the Abstract Truth (1964) and Sound Pieces (1966), both also on Impulse!.

The Blues and the Abstract Truth is an album by American composer and jazz saxophonist Oliver Nelson recorded in February 1961 for the Impulse! label. It remains Nelson's most acclaimed album and features a lineup of notable musicians: Freddie Hubbard, Eric Dolphy, Bill Evans, Paul Chambers and Roy Haynes. Baritone saxophonist George Barrow does not take solos but remains a key feature in the subtle voicings of Nelson's arrangements. The album is often noted for its unique ensemble arrangements and is frequently identified as a progenitor of Nelson's move towards arranging later in his career.