The Moody Blues were an English rock band formed in Birmingham in May 1964. The group initially consisted of Graeme Edge (drums), Denny Laine (guitar/vocals), Mike Pinder (keyboards/vocals), Ray Thomas (multi-instrumentalist/vocals) and Clint Warwick (bass/vocals). Originally part of the British beat and R&B scene of the early-to-mid-1960s, they came to prominence with the UK No. 1 and US Top 10 single "Go Now" in late 1964/early 1965. Laine and Warwick both left the band in 1966, with Edge, Pinder and Thomas recruiting new members Justin Hayward (guitar/vocals) and John Lodge (bass/vocals). They embraced the psychedelic rock movement of the late 1960s, with their second album, Days of Future Passed (1967), a fusion of rock with classical music. It has been described as a "landmark" in the development of art rock and progressive rock, and "one of the first successful concept albums".