Stuck Song Syndrome

The Boston Globe asks, Can science explain why ABBA is so catchy?
It only takes a single exposure, and in an instant, your whole day can change. The infection is rapid and feels potentially unending. One minute you're minding your own business and the next you find that you can't stop thinking, humming, or singing "Dancing Queen."

NPR says such insistent repeating melodies often occur during the summer and provides some of its favorites.

Stuck song syndrome annoyed, frustrated, and irritated women significantly more than men. And earworm attacks were more frequent -- and lasted longer -- for musicians and music lovers. Slightly neurotic people also seemed to suffer more.