Reply To: TVLine Jan 22: A Musical Episode (Confirmed Feb 2)

Question: Will Emma and Regina sing together in Once Upon a Time‘s musical episode? —SwanQueenCreative
Ausiello: Hmm, it depends on what you mean by “together.” What we can say is that Regina, in the form of the Evil Queen, has a rousing solo in which she at one point slides on her knees à la Freddie Mercury. “The Queen has moves,” Lana Parrilla said with a smile during Matt Mitovich’s visit to the set. “She’s a rock star.”

Source: http://tvline.com/2017/03/22/bones-series-finale-447-mystery-spoilers-season-12/