in actuallity, nothing is original but just modified over and over and over. Very few people come up with original riffs. They mostly spin offs over wriffs in combination with other riffs even though it might be unconscious that you actually understand this when composing. its much to the same effect as writing, check the bible, everystory ever written is essentially in there in a form or another...now where the bible on rock? :)
WWSD? What would stevie do?