Deram executives were initially sceptical about the hybrid style of the resulting concept album. Released in November 1967, "Days of Future Passed" peaked at No. 27 on the British LP chart. Five years later it reached No. 3 on the "Billboard" chart in the US. The LP was a song cycle or concept album that takes place over the course of a single day. The album drew inspiration in production and arrangement from the pioneering use of the classical instrumentation by the Beatles, to whom Pinder had introduced the mellotron that year. It took the form to new heights using the London Festival Orchestra, a loose affiliation of Decca's classical musicians given a fictitious name, adding the term "London" to sound impressive, to provide an orchestral linking framework to the Moodies' already written and performed songs, plus overture and conclusion sections on the album, including backing up Graeme Edge's opening and closing poems recited by Pinder. Strings were added to the latter portion of the album version of Hayward's "Nights in White Satin" (absent on the single) but the orchestra and group never performed together on the recording, with the band's rock instrumentation centred on Pinder's mellotron. Despite being a lush concept album, the LP was cut in a very workmanlike manner, with the band recording a particular song, then the track being presented to Peter Knight who quickly composed a suitable "linking" orchestral portion, which the Decca musicians ("London Festival Orchestra") then recorded. The album was as much an original work by Knight himself as the group. The composing credits were listed on the sleeve as: "Redwave-Knight", although Hayward wrote "Nights..." and "Tuesday Afternoon", Thomas provided "Another Morning" and "Twilight Time", Lodge penned "Peak Hour" and "Evening (Time To Get Away)", and Edge contributed the opening and closing poems (the first "Morning Glory" and the latter titled "Late Lament") read by Mike Pinder who composed both "The Sun Set" and "Dawn is a Feeling" (sung by Hayward, with Pinder singing the bridge section).