Super Audio CD (SACD) is a high-resolution, read-only optical disc for audio storage. Sony and Philips Electronics jointly developed the technology, and publicized it in 1999. It is designated as the Scarlet Book standard. Sony and Philips previously collaborated to define the Compact Disc standard (as well as the S/PDIF digital audio cable specification). SACDs allow greater dynamic range and may hold more playing time than CDs.

SACD is capable of encoding recorded audio in either stereophonic sound or surround sound. Although SACD audio streams are encoded in a pulse-density modulation (PDM) scheme called Direct Stream Digital (DSD), a manufacturer may also write a Pulse-code modulation (PCM) "layer" compatible with conventional Compact Disc players.

SACD is a disc of identical physical dimensions to a standard compact disc; the density of the disc is the same as a DVD and it encodes audio using a process known as Direct Stream Digital. The SACD sampling rate is 2.8224 MHz and the resolution is one bit. A stereo SACD recording can stream data at an uncompressed rate of 5.6 Mbit/s, four times the rate for Red Book CD stereo audio. SACD recordings can have a wider frequency and dynamic range than conventional CDs.

Nathaniel Adams Coles (March 17, 1919 – February 15, 1965), known professionally as Nat King Cole, was an American musician who first came to prominence as a leading jazz pianist. He owes most of his popular musical fame to his soft baritone voice, which he used to perform in big band and jazz genres. He was one of the first black Americans to host a television variety show, and has maintained worldwide popularity since his death.

Nathaniel Adams Coles was born in Montgomery, Alabama, on Saint Patrick's Day (March 17) in 1919. When he was 4, he and his family moved to Chicago, Illinois, where his father, Edward Coles, became a Baptist minister (Ruuth 31). Cole learned to play the organ from his mother, Perlina Coles, the church organist. His first performance, at age four, was of "Yes! We Have No Bananas". He began formal lessons at the age of 12, eventually learning not only jazz and gospel music but also European classical music, performing, as he said, "from Johann Sebastian Bach to Sergei Rachmaninoff".