Miles Davis defined many styles throughout his career, but his transitions between them are just as intriguing. “When Lights Are Low” is relaxed hard bop that has traces of the rich space from his late-'50s work, and the sublimely loose “Iris” sees his second classic quintet easing into subtle avant-garde improvisation. “Mademoiselle Mabry (Miss Mabry)” teeters on the edge of fusion with small scraps of funk and rock.