Sometimes its just you humming, or it rumbles in the background. Other times it echo's and threatens your sanity. Hearing the song will sometimes help. Singing the song usually helps.
Some are not too bad others are nightmarish. XTC's "The Mayor of Simpleton" rocked my cortex the other day. Worse was the replaying of ABBA's "Mama Mia" a while ago. The Toy Dolls "Nellie the Elephant" worked its way from Temporal to Frontal lobe. The Cures "Friday I'm in love" has made an apperance as well.
The worse one ever was Blondies "One way or another" which took a week to drive out of my skull.
(Links provided for attempted Occiptial reconciliation).
Anyone care to share?