Most producers don't include instruments in their songs that are playing out of key. The reason being instruments playing out of key sound dissonant (or bad depending on your point of view) and can be unsettling to the listener. However when it comes to drums, many skilled producers load up a sample, put it in their song and process it with EQ, distortion, and compression without giving a second thought to pitch. This could be that many people assume drum sounds don't have a distinct pitch. These people are wrong.