Sorry if this isn't a lot of help, as I don't know a lot about the song either. SO if no one responds, I'll understand. :)

In Episode 17, there's a piano version of "Ai to Hi" (Sadness to Sorrow?) playing in the background of while Haku recounts his past to Naruto. It's playing at about ~13 minutes or so on this fansub I have. (Is that legal to post - I'm not linking to it, so I think it's OK.) I've found different versions of the song elsewhere, but they don't have that 'full' sound that arrangement has, but more of a lighter sound as found is the first OST.

Anyone have any leads?

http://www.youtube.com/watch?v=IdX-pPZpQiw Is this the song your talking about? If so I have it for mp3, but I dont think im supposed to put mp3files on here. Contact me if you want it ^_^

Filled Requests>Index link.

I couldn't find the exact song on there (Sorrow and Sadness, piano version), but a getting to Naruto Sound and poking my head around solved the problem. :)

Thanks.

there is 2 vertion sadnes and sorow and grief and sorow its the mosty bietiful naruto song sadnes and sorow can be finded easely in midi or mp3 but grief and sorow i find it only in mp3

but grief and sorow i find it only in mp3
try josh's site or my forum (in french but specialized in naruto's stuff)