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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.
Required, but never shown