So guys, listen up.
I might be wrong, but I think Sonata is a Stark, Sansa Stark to be precise.
When Joffrey got killed Sansa and Cercei had their hands in the murder, this is probably because they voted to get Joffrey killed off.
Everyone who voted for Joffrey to get killed off are, including me; Seth Rollins, ApocalypseArisen, Lostheart, Ninja Aiden, Netto Azure, Arachnidsgrip, Mana, Eros, Absol used Bite, and Sonata.
Seeing how Sonata is on tonight's list.. I can only come to one conclusion.
Sonata is Sansa Stark.