As far as the one shot drum hits being sampled and used..... yeah there was a BIG flap over that topic.... it was happening on a number of rap CD's and the rappers who owned the copyrights were suing the ones who "appropriated" the samples..... one hit.... lawsuits and gun shots abounded....
Now days, if you are placing any of your music with music libraries the question that is asked on every single song submitted before it is accepted into the library catalog.... "Do you own ALL the rights for your samples?"
releasing it with that sample in it will probably not attract the attention of the owners for small releases to the net.......... but if that song is ever used commercially.... get the license before it goes public such as TV or film.