OST in Naruto Shippuden What is the ost playing at 1:54-3:53 in episode 456 of Naruto Shippuden?
The same song can also be heard in episode 368 at 1:31-2:33.
This sounds like an unreleased track. It doesn't show up in any of the soundtrack albums listed on the Wikia.

There are some unofficial imperfect versions floating around on YouTube.