Jazz bass players were largely limited to timekeeping with drums, until Duke Ellington's bassist Jimmy Blanton began a transformation in the instrument's role at the end of the 1930s. Chambers was about 15 years old when he started to listen to Charlie Parker and Bud Powell, his first jazz influences. Oscar Pettiford and Ray Brown were the first bassists he admired, and these were followed by Percy Heath, Milt Hinton and Wendell Marshall for their rhythm section work, and Charles Mingus and George Duvivier for their technical prowess and for their efforts in broadening the scope of jazz bass. Blanton was his all-time favorite.