Miles Davis pushing the envelope and what a quintet, with Wayne Shorter, Herbie Hancock, Ron Carter on bass and Tony Williams on drums. This kind of jazz is an acquired taste, for me anyway, for those who like Kind of Blue. The rhythms are slower and languid, and the solo lines are long and unhurried. I am a fan of Shorter's ts, and love the cymbal splashes by Williams. One of my favorite Miles Davis works of the middle period when he was at his peak IMHO. This is jazz as abstract art. Great stuff and great sound.