What is the song playing in Naruto Shippuden episode 121 when Itachi and Kisame are walking together?


In _Naruto Shippuden_ episode 121, it starts playing at 0:40 or so when Itachi
and Kisame are walking together.




The song you're referring to is Itachi's theme song.
<https://www.youtube.com/watch?v=AXLfg2ry_F4>

