Lunn has already been on set for season three, again playing piano and coaching a cast member who sings a song.
You'll recall in season two, Lady Mary sang "If You Were the Only Girl in the World" for a roomful of soldiers when devastatingly handsome, Cousin Matthew, came walking in after being missing for a few days during the War *swoon*
Who could be singing in season three & in what scene? Could it be at Matthew & Mary's wedding? Hmmm...let the speculation begin!