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 ...

First there’s Pitbull. “I know you want,” he chants. And then: “Pop,” “dance,” “rock ‘n’ roll” — the genres burst out as the video cuts to Lady Gaga, Kelly Clarkson, will.i.am of the Black Eyed Peas, ...