What is the music that plays when Juzo sacrificed himself to save Itachi?


In _Naruto Shippuden_ ep. 456 at around 14:48-15:35, there's a music which
plays after Juzo sacrificed himself to save Itachi. The music [starts at 5:09
in this YouTube video](https://youtu.be/VCNSY5JC1JA?t=5m9s).




It's 100% Sai's Theme Song. The bit you hear in the Juzo death scene starts at
0:27 <https://www.youtube.com/watch?v=enD0LhHJ8Gw>

