What makes someone a great artist? Surely one of the criteria has to be to what extent they have revolutionised their art form. On that measure alone the trumpeter Miles Davis must be regarded as one of the most innovative and creative musicians of the 20th century.
At the age of 18 he played an important part in the musical revolution called bebop. Throughout his 50-year career he released many outstanding records but in 1959 he surpassed any of his previous work with the release of Kind of Blue. Modal jazz was born. Again in 1970 Davis released another era-defining and path-breaking album Bitches Brew (that Davis used the sexist word "bitch" in the title, as a term for excellence, clearly taints the album).