The first clash in the opening round of the 2013 Ultimate Classic Rock Bowl finds us covering the entire rock and roll alphabet, as Aerosmith and ZZ Top square off. Over the next month, 16 of rock’s biggest bands will compete against each other in a series of single-elimination matches to determine the champs of rock.

As you can see from this photo, ZZ Top's Billy Gibbons has his meanest game face on, but Aerosmith singer Steven Tyler seems to be laughing off any thought of backing down. Both of their bands have over four decades of classic albums and legendary tours on their resumes, and each delivered impressive new records in 2012.

So will it be the bad boys from Boston, or that little old band from Texas who gets to move on to the quarterfinals? That's up to you. You can vote in each of the eight first round matches every hour until they close on Sunday, Jan. 13 at 11:59 PM ET. The 2013 Ultimate Classic Rock Bowl winner will be announced Feb. 4 — the day after Super Bowl XLVII.

Ultimate Classic Rock Bowl
Ultimate Classic Rock