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This bedrock layer of improvisation, almost beyond the scope of musicology, is the psychology or personality of the individual musician.
Ted Gioia • How to Listen to Jazz
arranger Gil Evans,
Ted Gioia • How to Listen to Jazz
Songwriting Without Boundaries: Lyric Writing Exercises for Finding Your Voice
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In the black neighborhoods, he learned that developing one’s own sound was essential and that sound and feeling were paramount over technique.
Leonard Brown • John Coltrane and Black America's Quest for Freedom: Spirituality and the Music

Check out how bassist Paul Chambers interacts with drummer Philly Joe Jones on those classic jazz recordings from the 1950s; or Ron Carter and Tony Williams in the 1960s; or Christian McBride and Brian Blade in the current day. No,
Ted Gioia • How to Listen to Jazz
tracks in which soloists exchange four-bar phrases with the drummer or with each other.
Ted Gioia • How to Listen to Jazz
The Wayward Mind by Guy Claxton.