Sampling!

[Shiva]

So if you have heard a track, and you are wondering hmm, that sounds familiar to another song. This website will tell you from which track it has sampled from and if you cant be assed to get your 2pac booklet out, it has a lot of tupac tracks. Not only rap, but all kinds of music!

WhoSampled - Discover and Discuss Music Samples and Cover Songs

[2Lek]

I know that site We got more info about 2pac samples