http://www.whosampled.com/
Look up samples by the songs they appear in, or vice versa.
I (finally) learned
the origin of one of my favorite beats.
The drummer is Darryl Brown, according to
Discogs.
Here's the whole song. The famous loop is the first six seconds.
Here's an example of the speed I like to play it at, as a warm-up/accuracy exercise: