 Raney recounts his comment to Parker that a section from the Scherzo of the Bartók's Fifth Quartet sounded a lot like some of Parker's jazz improvisation.The classic bebop combo consisted of saxophone, trumpet, double bass, drums and piano.This was a format used (and popularized) by both Parker (alto sax) and Gillespie (trumpet) in their 1940s groups and recordings, sometimes augmented by an extra saxophonist or guitar (electric or acoustic), occasionally adding other horns (often a trombone) or other strings (usually violin) or dropping an instrument and leaving only a quartet.