Miles asks Herbie Hancock to play Fender Rhodes electric piano at a session that also includes electric guitarist Joe Beck. While the track “Water on the Pond” is not released immediately, it marks a line-in-the-sand moment: in a widening embrace of new textures and sounds, Miles will continue to explore the inclusion of electric instruments—keyboards, guitar, bass and eventually sequencers and drum machines—into his music. Generations continue to follow his lead.