Brass

This fanmade singamajig is brass yellow with black star eyes, the same shirt as Prototype Pink with the colors inverted (multicolored w/ purple dots), a silver nose and a juniper green mouth. He sings "Greensleeves" and has the same voice as the Robot.

Here's how he signs on, enters song mode and signs off:

Sign on: Hello.

Song mode entry: Let us sing.

Sign off: Goodbye.