Mash-ups — the combination of a vocal track from one song and the instrumental from another — are the first meaningful artform to come out of home studio programs. They're extremely illegal (this album has no credited artists or record label) and, for fans who know their music, extremely entertaining. Freelance Hellraiser's Strokes/Christina Aguilera mash-up of is one of the top 5 songs of the year.
Top Tracks: A Stroke of Genius, Smells Like Booty, Bium Bium Bamabalo
The Piano Man conquers Broadway, Eminem goes Hollywood, plus the rest of TIME's picks for the best of the year