I hope they add more songs to this website, because I NEED MORE!!!
A friend of mine sent me this link yesterday and I've been doing nothing else since. Basically, you take a song from the left column and drag it over to the right and drop it on one of the highlighted songs. And they're AWESOME.
My faves so far:
Overnight Celebrity + Short Skirt, Long Jacket
Country Grammar + Sugar, We're Going Down
In Da Club + A Thousand Miles
Start mixing now. Check out TheMagiciPod.com.