The Absolutely Essential 3CD Collection of piano jazz legend Thelonious Monk features over 40 tracks across 3 CD's. Often regarded as a founder of bebop, Monk's playing later evolved away from that style. His compositions and improvisations are full of dissonant harmonies and angular melodic twists, and are consistent with Monk's unorthodox approach to the piano, which combined a highly percussive attack with abrupt, dramatic use of silences and hesitations.