It's been seven amazing months and 30 great Mashup Mondays videos, and it's time to wrap the 2011 run -- but not until we find out what you think was the single best cover of the whole season. There were so many inspired renditions -- from Grace Potter belting Beyonce and Wonder Girls tackling Bruno Mars' "Nothing On You" to Hanson's poppy take on Weezer's "Troublemaker" and Greyson Chance singing his heart out on Alicia Keys & Jay-Z's "Empire State of Mind" and many more. So you'll have a tough time choosing your favorite. Rewatch all of the videos from the season in the player above -- they're in alphabetical order by artist. Then vote for your favorite in the poll below. We'll announce the winner -- the ultimate mashup of 2011 -- on Sept. 26.

Link to poll - Vote Now!