Melissa Gold is a former villain turned heroine in The Avengers, X-Men and Thunderbolts franchises. She is a mutant who was created as a a result of undergoing the Power Broker augmentation treatment. She had the ability to manipulate sound waves and lengths and the ability to manipulate her voice. She used to be the criminal known as Screaming Mimi and later became Songbird.
The character first appeared as Screaming Mimi in Marvel Two-in-One #54 (August, 1979), and was created by Mark Gruenwald, Ralph Macchio, and John Byrne.