Shorter’s compositions for Davis took the raw ingredients of hard bop and stretched them out, exploring the modal space that Davis had outlined a few years earlier in Kind of Blue. Shorter’s surprising, angular melodies had a singular and unpredictable beauty. Floating above chords arranged into glistening, half-seen shapes, they sketched out logical figures that tailed off into fluid emotional whimsy. At other times they cut deep into the logical bedding of the music, bringing light to unseen corners. Coltrane proceeded via exhaustion and explosion, never letting any musical or emotional wall remain standing; Shorter and Davis preferred the scalpel.