Post-bop is a jazz term with several possible definitions and usages.[1] It has been variously defined as a musical period, a musical genre, a musical style, and a body of music, sometimes in different chronological periods, depending on the writer. Musicologist Barry Kernfeld wrote in The New Grove Dictionary of Music and Musicians that post-bop is "a vague term, used either stylistically or chronologically (with divergent results) to describe any continuation or amalgamation of bop, modal jazz, and free jazz; its meaning sometimes extends into swing and earlier styles or into fusion and third-world styles."[2]