The "SEALED!! Mr. Blue Sky: The Very Best of Electric Light Orchestra CD 2012" is a compilation album featuring the greatest hits of the iconic band Electric Light Orchestra. Released by Frontiers Records, this album includes re-recorded and revisited songs in stereo format. Produced by Jeff Lynne, this best-of edition showcases the band's iconic rock and rock & pop style, with a run time of 49 minutes. This CD comes in a cardboard sleeve with a blue color scheme, making it a must-have for fans of ELO from the 1970s to the 2010s.