Mashed-Up Music

An unnamed reader submits: "The New York Times is running this article (also available here) about "mash-ups:" songs created by digitally synchronizing instrumental tracks with vocal tracks from two (or more) existing songs. Often the source songs are wildly disparate, and the result is frequently better sounding than you might first expect. Who knew that Christina Aguilera mixes well with The Strokes or that Nirvana and Destiny's Child make a good combo?" This is an interesting answer to arguments that online music sharing is nothing but theft.