Ooh, that smell!

So I'm with a group of people the other day at TPP for our staff meeting lunch.  All the sudden someone starts singing "ooh, that smell!"  At first, I checked to make sure that I wasn't having a Grandpa Probert standby sandwich: Limberger Cheese.  No, just ham and white American. 

Then he starts laughing and says that he and his wife woke up to WDVE on the radio and the Skynard song "Ooh, That Smell."  We had a brief conversation (frequently interrupted by him singing another soundbyte of that glorious song) about why you get a song stuck in your head.

The problem is, we never figured out why.  Any ideas?  And why is it usually a song we really don't care for anyhow?  I'd like to thank you, Wayne, for allowing me to have that ridiculous song "Ooh that smell" stuck in my head for like a week now.  If you'll excuse me, I'm going to step out onto my front porch and sing it at the top of my lungs...maybe that'll help.