In the same way that I hear a little West Side Story latino protagonist in Tom Petty,
I hear an obsession with The Wizard of Oz all over ELO's music. Listen to Mr. Blue Sky and its all there- The swelling munchkinland choral sounds, quickly descending tornado string flourishes, and sacharine orchestral arrangements. Jeff Lynne & Co. acknowledge the influence with the Eldorado album cover shown here. Can't Get it Out of My Head, from that album, features some major Land of Oz backing vocals during the bridge and last verse/chorus.

CAN'T GET IT OUT MY HEAD