In Search of the Lost Chord is the third album by the Moody Blues, released in July 1968 on the Deram label.
The success of the band's previous record, Days of Future Passed, allowed the group additional studio time and creative flexibility in crafting a follow-up album. At the time, keyboardist Mike Pinder told the Melody Maker, "Albums give us a chance to experiment with new ideas. And buyers realize they offer more than just music to dance to. They can sit down and listen – get away on a trip of musical exploration." Guitarist Justin Hayward recalled that In Search of the Lost Chord "was when I feel we found our soul and direction. It was when everything gelled musically."

Edward Kennedy "Duke" Ellington (April 29, 1899 – May 24, 1974) was an American composer, pianist and bandleader of jazz orchestras. His career spanned over 50 years, leading his orchestra from 1923 until he died.
He is widely regarded as the most important jazz composer and bandleader, with some admirers even seeing him as America's greatest composer in any musical field, with a vast library of compositions, from pop songs to extended works. The sidemen in his band included many leading jazz soloists, and he influnced many younger performers, from Miles Davis and Charles Mingus to Stevie Wonder and Steely Dan.

Prince of Darkness is a box set of four CDs by Ozzy Osbourne released in 2005. The first two CDs are Osbourne's solo work containing various studio recordings, live tracks, b-sides, demos and outtakes, and the last two CDs are collaborations on disc three and cover songs on disc four. The cover versions were recorded for this box set compilation, but were released on a stand-alone album entitled Under Cover later in the year.
Notably, the album tracks from Blizzard of Ozz and Diary of a Madman included in the set are taken from the 2002 remasters of those albums, for which the original drum and bass tracks were replaced with new recordings by Osbourne's then-current bassist Robert Trujillo and drummer Mike Bordin, as a management response to legal action by original bassist Bob Daisley and drummer Lee Kerslake for unpaid royalty fees. Likewise, the tracks from Bark at the Moon are similarly taken from the 2002 remaster, for which they were remixed and altered.

Edward Kennedy "Duke" Ellington (1899-1974) was a jazz pianist and band leader, one of the big names in the history of the genre, and one of the USA's greatest popular composers.
He hailed from a middle-class family in Washington, DC, and learned piano both from lessons and from imitating the ragtime pianists in the community. After attaining modest success in DC as a pianist and jazz band leader, Duke sought the big time by taking his band to New York City, the center of the music world and the most glamorous scene of The Roaring Twenties. He first played in the Kentucky Club, then the Cotton Club, honing his songwriting chops and gathering more musicians around him until he was no longer leading a band but an orchestra. During the 1930s and 1940s, as big-band swing grew in popularity throughout the US and the world, Duke's jazz orchestra became renowned as one of the best.

Son orchestre big band est un des plus réputés de l'histoire du jazz, avec ceux de Count Basie, Cab Calloway, Tommy Dorsey, Benny Goodman, Glenn Miller, Artie Shaw, Stan Kenton, Woody Herman comprenant des musiciens qui sont parfois considérés, tout autant que lui, comme des maîtres de cette musique et virtuoses de leurs instruments.