 Jazz-rock "...generally grew out of the most artistically ambitious rock subgenres of the late '60s and early '70s", including the singer-songwriter movement.Many early US rock and roll musicians had begun in jazz and carried some of these elements into the new music.In Britain the subgenre of blues rock, and many of its leading figures, like Ginger Baker and Jack Bruce of the Eric Clapton-fronted band Cream, had emerged from the British jazz scene.