I belive the song will be different that I.V. and Jade, Yoshiki did go throug surgery, and that can give you a lot of inspiration.
And about Taiji I too belive that he had great influence, but I think that was mostly becouse he would tell anything on his mind (atleast I have that inpresion of him) other members are, well, hide is death, Pata sims OK as long as he can play, Heath is too much of a good boy and Toshi, well he could do something.