 The Doors became the first group to use the Moog synthesizer on a pop record on 1967's "Strange Days".Other bands, including The Moody Blues, The Rolling Stones, and The Beatles would go on to add it to their records, both to provide sound effects and as a musical instrument in its own right.In 1966, Billy Ritchie became the first keyboard player to take a lead role in a rock band, replacing guitar, and thereby preparing the ground for others such as Keith Emerson and Rick Wakeman.