Replying to Mixing Songs

Alright, im trying to find a good program that blends songs together. Not like the one that comes with winamp3 or anything, but i mean something good enough for Dj's, something that measures the BPM and replicates the sound to blend it with another song's BPM and so on. Macs have a program that can do this, but im on a PC, so is there one out there?
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^Rowen^
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