does anyone know where i can find the piano sheet music for their songs?

Unless you want to buy it online, or download it, it's very hard to get a hold of. A girl on youtube emailed me her sheet music for one Evanescence song and that was nice of her. You should try that, though you need to be careful as you will get low lifes that will try and email you a virus. Try buying the 'Fallen' song book on line, it's got alot of Evanescence sheet music off there first album. I do tutorials on youtube (it's when someone will teach you how to play a song without sheet music) it's as an alternative way to learn a song but it works for me. If you can't get a hold of the sheet music, then I strongly suggest you try this - it's amazing!
Good Luck