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What song is played in Naruto Shippuden episode 21 Sasori's Real Face at 11:30 when Granny Chiyo sees Sasori's face. He replies "What's the matter Granny Chiyo are you so filled with emotion you can't speak?"
I found it. It is called Sai's theme.
It's an unreleased OST in the naruto series
Required, but never shown