Not really a whole song, but I've had the violin bow part of the How Many More Times lead stuck in my head for about a week (you know, the part right before Plant goes into the "Oh Rosie!" bit).
A similar thing happened decades ago when I had a short part of Crimson's Starless lead stuck in my head.
A similar thing happened decades ago when I had a short part of Crimson's Starless lead stuck in my head.