for me it doesnt matter....whichever song at the time gives me a mood of euphoria(sp), and i use that to clear my head, and then clench my teeth and try and make myself get angry...this way since i listen to my music loud when i lift, it filters out all destractions, takes away any sort of fear i ahve of the weight im about to move, and then the anger gives me the added burst. but a song that will motivate me one day wont necesarily work the next day