As most of you already know, a mashup is a song or composition created by blending two or more pre-recorded songs. This is typically accomplished by overlaying the vocal track of one song seamlessly over the instrumental track of another.
I have always felt that the best music takes in the sum of its influences and then adds something new to the equation. To my ears, a good mashup personifies this concept by taking music that already exists and turning it into something new.
If you are interested in hearing some good examples, here are a few of my favorites:
Artist: My Sick Uncle
Mashup: Lil Wayne vs. The Soundtrack for 500 Days of Summer
Title: 500 Days of Wheezy
Artist: Wugazi (Cecil Otter and Swiss Andy)
Mashup: Fugazi vs. Wu Tang Clan
Title: 13 Chambers
Mashup: Jay Z (The Black Album) vs. The Beatles (The White Album)
Title: The Grey Album