Herbie Hancock's album called "Inventions and Dimensions" is one of his most unique. Almost every composition is 'off the top'....total improvisation, with the exception of one tune where Hancock wrote down a few chords to play. Mr. Hancock performs with the ex-Miles Davis bassist Paul Chambers and two Latin percussionists: Willie Bobo(William Correa) on regular drums and timbales and Oswaldo "Chihuahua" Martinez on guiro, congas, bongos etc. This recording is an overlooked masterpiece.