ELO leader Jeff Lynne has always had an ear for grand soundscapes and Beatlesque hooks—hear the echo-chamber pop of “Mr. Blue Sky” or the chugging boogie of “Don't Bring Me Down”. He lends those production signatures to Tom Petty's shimmering heartland rock, George Harrison's upbeat harmonic drive and Olivia Newton-John's “Xanadu”, a sparkling slice of disco that glides as if on roller skates.