The Brady kids were one heck of a musical act.

Gonna have to go with The Beets

Motherboy
Misfits (from Jem)

Call me Old Fashioned cuz I still give it up for "Josie and the Pussycats" - 1970: 

So far, we've all mentioned bands, but I'm going to switch things up by naming a fictional solo artist, Sugar Kane from Beach Blanket Bingo. Linda Evans didn't actually do the vocals in this, but it's still a catchy tune.

Blues Brothers

Dr. Teeth and the Electric Mayhem.

The Potato Bug

There is only one correct answer for those who have had the pleasure of seeing him, and that is Mel Zorro!

Alvin and the Chipmunks deserves a mention.