Five albums that show what a handful of players can do when they listen to each other. Miles Davis's Kind of Blue is the way in - unhurried, open, the record that has turned more people into jazz listeners than any other. From there the pack widens: Coltrane's A Love Supreme reaches for something devotional, Mingus Ah Um swings hard and argues with itself, Monk's Dream bends the rules of melody, and Chet Baker sings as softly as he plays. Small groups, big ideas.