'Days of Future Passed' is a 1967 album by which of the following bands?

'Days of Future Passed' is the second album and first concept album by English prog rock band The Moody Blues, released in November 1967. With its fusion of orchestral and rock elements, it has been cited as one of the first examples of progressive rock. Progressive rock (shortened as prog rock or simply prog; also known as classical rock or symphonic rock; sometimes conflated with art rock) is a broad genre of rock music that developed in the United Kingdom and United States throughout the mid-to late 1960s, peaking in the early 1970s.

The album was a moderate success upon release, but following steady radio airplay, particularly of the hit single 'Nights in White Satin', it became a top ten US hit in 1972. It has since been listed among the most important albums of 1967 by 'Rolling Stone' magazine.

The Moody Blues were an English rock band formed in Birmingham in 1964, initially consisting of keyboardist Mike Pinder (born 27 December 1941), multi-instrumentalist Ray Thomas (29 December 1941 – 4 January 2018), guitarist Denny Laine (born 29 October 1944), drummer Graeme Edge (30 March 1941 – 11 November 2021) , and bassist Clint Warwick (25 June 1940 – 15 May 2004). The group came to prominence playing rhythm and blues. They made some changes in musicians but settled on a line-up of Pinder, Thomas, Edge, guitarist Justin Hayward (born 14 October 1946), and bassist John Lodge (born 20 July 1945), who stayed together for most of the band's 'classic era'.