Paul Laurence Dunbar Chambers Jr. was an American jazz double bassist. A fixture of rhythm sections during the 1950s and 1960s, he has become one of the most widely-known jazz bassists of the hard bop era. He was also known for his bowed solos. Chambers recorded about a dozen albums as a leader or co-leader, and over 100 more as a sideman, especially as the anchor of trumpeter Miles Davis's "first great quintet" and with pianist Wynton Kelly.