I’ve listened to a lot of mashups in my day. Normally they are party tracks that take a popular club beat and superimpose the vocals of a top 40 track of the moment ala Girl Talk or sometimes they tend to dig a little bit deeper to give us something like last year’s Kids and Explosions or the noted Jay Z/Linkin Park collaboration, but every once and a while I’ll stumble upon a mashup that truly leaves me floored. Four Tet’s mash up of Nas’ “It Ain’t Hard to Tell” with Godspeed You! Black Emperor’s “Sleep” is simply mesmerizing. The ebb and flow of Nas’ rhymes and the gentle swell of strings that build and build come together so flawlessly that it was almost as if they were made for each other.