It has a huge database of the original samples and the artists who sampled them and has a 30sec clip of each with all the artwork .
use google to translate i think it's in German but it's a dope site to have.
so you know who sample what, also so you don't make a track with a sample that has been used already or in case you want to flip a different part of the same sample it differently
http://www.ultragraphik.com/blog/
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