"Can't Get It Out Of My Head" was ELO's first U.S. Billboard charts Top 10 hit from their fourth album, released in July, 1974, "Eldorado, A Symphony", also known as simply "Eldorado".
"Eldorado" was the first complete ELO concept album and their first "Gold" album. Jeff Lynne conceived of the entire story before he wrote any music.
The story follows a Walter Mitty-like character who mentally journeys into fantasy…
Midnight on the water
I saw the ocean's daughter
Walking on a wave she came
Staring as she called my name