One of the most important figures in the history of jazz music, Miles Davis was a trumpeter, composer and bandleader whose work over the course of a five-decade career helped to usher the genre from the be-bop era into bold new areas of improvisation, structure and fusion with other musical forms. He rose to prominence during the late 1940s, collaborating with his mentor, Charlie Parker, before striking out on his own with a series of players, including such legendary figures as John Coltrane and Thelonious Monk, who backed his development of the "cool jazz" and hard bop movements. The late 1950s and 1960s was unquestionably his most accomplished period, encompassing not only his experiments with the free-flowing modal jazz sound on the seminal Kind of Blue (1959), but also sonic journeys into music formed by the collision of soul, classical, rock and funk on Bitches Brew (1970) and other adventurous albums. A period of decline in the late 1970s led to a slow career revival in the 1980s, after which he assumed the mantle of elder statesman while continuing to push the boundaries of jazz with programmed music and elements of hip-hop. His death in 1991 signaled the end of one of the most creative careers in modern music, but the influence of his work on several generations of performers in nearly all genres remained potent, indelible and unquestionable.