Coba ceritain soal Bebop

"Secara teknis, bebop berkarakter tempo cepat, harmoni komplex, melodiyang penuh perubahan, dan rhythm sections yang laid down a steady beat only on the bass and the drummer's ride cymbal. Bebop tunes were often labyrinthine, full of surprising twists and turns. All these factors - plus the predominance of small combos in bebop - set the music apart from the Swing bands of the 1930s."

- from David H. Rosenthal's book, Hard Bop, published by Oxford Paperbacks, New York, 1992

And coming out of bebop, with the assistance of Miles Davis, and a few other cats, came Cool, and, following closely on its heels and borrowing the suffix, Hard Bop.