This book could occupy all of your time if you wished. It is an essential read for every composer, containing the manual that nearly all great classical composers learned from. Contemporary composers still use it today both as a way to learn and a tool for teaching their students.
Firmly rooted in the American Mavericks tradition, this work fuses hymns with polytonality and misalignment, a la Charles Ives.
Mitch Weakley's piece "Keys, Strings, Clothespins" investigates a C pentatonic scale with a flattened sixth step (Ab) through the lens of a prepared piano, and its consequent timbres.
Matthew Kennedy's "Until I Say 'When'" is a breathtaking exposure of space, timbre, and mood, that is both playful and hypnotic.