Lester Young and His California Playboys were a prominent jazz ensemble in the mid-20th century, led by legendary tenor saxophonist Lester Young. Young's innovative, laid-back playing style, characterized by a light, fluid sound, greatly influenced the development of cool jazz. The band's hallmark was their seamless blend of swing and blues, which was groundbreaking during their peak in the 1940s and 1950s. Among their most celebrated works are the renditions of "Lady Be Good" and "Lester Leaps In".