West Coast Jazz After the Second World War, the sound of jazz underwent a massive transformation. Jazz split into different subgenera: bop, hard bop, and cool. Even more so, jazz broke into two coastal camps: West Coast and East Coast. The West Coast sound was characterized by a more structured, learned sound while the East Coast sound possessed more freedom. Mirroring these styles were two record labels that recorded the majority of music that arose from the period. On the East Coast, Blue Note Records captured many of the Hard Bop musicians while Los Angeles' Pacific Jazz label recorded the best music to come from West Coast musicians. The West Coast jazz sound was defined by a laid back, swinging feel. The style also referred to as "Cool" jazz. The music was soothing to the ears and created and overall feeling of relaxation. The East Coast sound, led by John Coltrane, Miles Davis and Theo Monk was much more intense and frenzied. Compared to the hour-long solos of Coltrane, the West Coast sound was much more accessible to the general public.