J.J. Cale was a seminal American singer-songwriter who profoundly influenced the genre of rock music. Known for his laid-back, "shuffle" style of blues and his use of drum machines and synthesizers, he significantly shaped the "Tulsa Sound." His work has been covered by a multitude of artists, most notably Eric Clapton, who popularized Cale's songs "After Midnight" and "Cocaine." Cale's distinctive approach to songwriting and performance left an enduring impact on rock and blues music.