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Cadmium was the sixth album by the progressive-classical rock band Sky, released in December 1983. The album contents were a mixture of Sky traditions and new elements – it contained a classical-rock arrangement of Prokofiev's "Sleigh Ride" (from the "Lieutenant Kijé Suite"), alongside seven original compositions and the first examples of commissioned compositions from contemporary writers from outside the band (in this case, Kevin Peek's old friend and fellow Cliff Richard collaborator Alan Tarney, who provided two original tunes). The colour of the album cover is primarily cadmium yellow, a pigment used by painters.