If you spent a lot of time and money listening to and accumulating the year's hottest pop hits, a new video mashup might make you wonder if it was all worth it. Sigh. Oh, sorry. Meant to say PSY.

YouTube has always been the playground of those with too much time on their hands. Sometimes the results are wonderous sometimes they are less thrilling. But Daniel Kim's 50-song, eight-minute mashup ...

Mash-ups allow DJs and editors to combine several song snippets to create a wholly new piece of art. Sometimes just the beat will be taken from a song and applied over the lyrics of another track. The ...