I've been searching for that song for a really long time but I can't find it. It's kinda sad (?? for me at least) and it has a violin or cello or something like that.
I think the track is actually called "Stalemate"
It's called Deidara's theme. https://www.youtube.com/watch?v=0Kd4mOSrTh8
At 0:42, the strings start playing.