Sometimes, they seem to be "mouth music," like a vocal intrumental break that allows for some improvisation; oftentimes they're tricky enough to show off the virtuosity of the person who can actually remember the refrain...and sometimes, they are used to, er, "arouse" the imagination...

"Jenny Jenkins" seems like such a simple, fun song to sing - but I'm not yet man enough to master the chorus. Some year, I'd get it down.

-Joe-