Anime: Kobato
Instruments: Piano+violin (or at least violin)
Title: Amber Sky

If needed, I can provide the mp3 file.

On a random note, has anyone listened to Kobato OST yet? It's so amazing! So many good tracks! Especially for a violinist

But this track.. I've been waiting for it ever since I've first heard it in the anime.

I wish someone would transcribe it.