Sonic Keytar

Sonic Keytar is a weapon that appeared in Despicable Me 3 where it was owned by Balthazar Bratt.

Despicable Me 3
After Balthazar Bratt and Felonius Gru had a dance fight, Gru punched Bratt into unconsciousness and thought he was defeated. Gru told it to Alpha Team, but Bratt only acted unconsciousness and, waking up, he plays Van Halen's 'Jump' on his Keytar to blow him away.

When they are in Hollywood, the giant robot collapses and a dance fight begins with Gru stealing his keytar. He plays Dire Strait's 'Money for Nothing' to defeat Bratt.

After blowing Bratt away, Gru threw the keytar down on the scrap where the robot collapsed and it wasn't seen anytime after that scene.