Didn’t make the cut for the Guggenheim’s YouTube Play? You can hone your skills on YouTubeMasher, which is like a six-turntable online DJ booth with YouTube as your record library. The Top 10 provides some good examples for inspiration, like this Justin Timberlake-Rihanna-Goat trio or this Bruce Lee percussion piece. You’ll be just like Girl Talk! (NOTCOT)