What kicks off with Ke$ha’s “Tik Tok,” then segues into Rihanna, Lady Gaga, Usher, Katy Perry, Jason Derulo, Miley Cyrus, and B.o.B before ending on a mushy note with Bruno Mars’s “Just the Way You Are”? No, it’s not the playlist for your little cousin’s Bar Mitzvah reception — it’s DJ Earworm’s mash-up of the top 25 songs of the year. The United States of Pop 2010 is truly something to behold. Whether the credit for the wonderful “Tik Tok”/”California Gurls” moment towards the end should go to Earworm or Dr. Luke is certainly up for debate. But we do have one question: Where’s Kanye?