Another PopWatch HeadScratcher to get you through the weekend:

We’re going to try something a little different this week. Consider, if you will, the following five bands:

The Commodores
Led Zeppelin
The Spin Doctors
The Wallflowers

Now, put them in an order — and be prepared to explain the logic behind said order. But there’s a catch: There’s a gap in the sequence. Tell us why the gap is there. [Bonus Points: Name a band that could fill the gap – there’s more than one possible answer.]

Send your best guess to Be sure to write “HeadScratcher” in the subject line and include your first and last names in your answer. I’ll post the most interesting responses Monday afternoon.