you just gotta play with the equalizer until you hear less of the drums. this will affect the rest of the sample sound though. there are probably plugins that do this too.
another trick i used to do back in the days is that sometimes (depending on how the original sound was recorded, the drums were more panned to one side or the other. so i would use Cool Edit Pro to delete the side with louder drums, copy the remaining side to the other side and then use equalizer to filter. again, this depends on how the original was recorded. whenever you notice both sides aren't the same, always check out what both sides sound like. you never know what you'll find. it might be drums, it might be lower vocals, etc...