But this is not just a play. This is a rock opera. Musical group the Beerded wrote and arranged all of the music, which the group performs live from a small elevated room embedded at the back of the stage like a treehouse. Not all of the actors are quite up to their singing parts, but there are plenty of standout performances. As Robinette woos Kar, her voice slides from sweet and melty to devilish and screechy, demonstrating an impressive vocal range that elicited spontaneous applause at one recent performance. Once Kar, mute throughout the first act, finds his voice, he uses it, then overuses it, then uses it some more, belting out lines and jumping octaves like the lead singer of an ’80s hair band, garnering his own applause. And Bowen is deliciously evil as Loki, perched atop a rocky cliff at the edge of the stage, grinning like a deranged jester, his deep voice booming both script and song.