Les Claypool dose play very well but he plays funk/rock, Steve Harris like Cliff Burton and Tyr are all heavy metal bass player, this means they play with there finger alone. Les Claypoll of Primus plays slap bass, yes he is very good but if you like that then listen to Geddy Lee of Rush, thats where Les draws most of his style from. Steve Harris is a very good bass player due to the speed of the picking. He uses his fingers which is hard to do when you are playing triplets at 240bpm. Steve's part are not that technical but they are bloody fast and thats what makes them hard to play. Wrathchild would also be a good cover as the bass part is played at 240bpm