Billy Williams was an American vocalist active during the 1950s and 1960s, known for his smooth crooning style reminiscent of the big band era. His signature song, "I'm Gonna Sit Right Down and Write Myself a Letter," showcased his ability to interpret popular standards with a unique blend of jazz influences and pop sensibilities. Despite his relatively short career, Williams played a significant role in the transitional period between big band music and the emerging pop genre. His work remains a notable influence in the American music tradition.