This whole album is a masterpiece, but "Blow Up" is a track that should definitely be better known. It's a vibes-piano-bass-drums quartet session with Herbie on piano that inexplicably was never released at the time, only in Japan over a decade later. It was available on CD for a while in the early 90s, but has since been deleted. The track builds on a steady, understated 4/4 groove anchored heavy bass and creative drumming courtesy of Joe Chambers. Eight minutes of relaxed heaven, with messrs. Hutcherson and Hancock engaging in sublime vibes/piano dialogue over a very catchy theme. Seek out this album any way you can!
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