"Burnin' For You"--Blue Oyster Cult
Neither of this group's two biggest hits made the Top 40, and both are included in Inside The Rock Era's popular feature, The Top Unknown/Underrated Songs of the Rock Era*.
This one came from BOC's eighth studio album, Fire of Unknown Origin. "Burnin' For You" stalled at #40, even though with two million singles sold, it outsold nearly all other songs out at the time.