The Muse

 was an android which had the power to make people do musical routines without there will.

Biography
The Muse was made by the Maharoni as an amusement. but when the Shasarak found out her powers could be used for destructive purposes they invaded and tried to steal her. She was sent off in a spaceship. The ship was gunned down and she was the only survivor, the townspeople took her in but the Shasarak were still on her trail. The Doctor soon arrived and managed to find a way of restoring the muse to full power. She then used the power to stop the Shasarak.