By Amy Ryan
Updated November 18, 2006 at 05:10 AM EST

Another PopWatch HeadScratcher to get you through the weekend:

What do these five acts have in common?

The Beatles
Kelly Clarkson
Neil Diamond
Led Zeppelin
Sly and the Family Stone

Your answer should be as specific as possible. Send your best guess to Be sure to write “HeadScratcher” in the subject line and include your first and last names in your e-mail. We’ll post the most interesting responses Monday afternoon.