Flashback is the second box set compilation by Electric Light Orchestra (ELO), released in 2000. In 2000, Jeff Lynne found a new impetus to work on the music of his old band and returned to the recording studio to work on an ELO project for the first time in some 15 years just prior to the comeback album Zoom in 2001. This work resulted in a digitally remastered compilation released in late 2000. Unlike its predecessors, this project, Flashback, was personally approved and endorsed by Lynne. The set includes songs featured from all 11 studio albums up to that point, including an edit of "Great Balls of Fire" from their live album The Night the Light Went On in Long Beach, plus some new recordings amongst the band's extensive back catalog, most notably a reworking of Lynne's only UK number one hit "Xanadu".