Fang is a jerk, an asshole if you will. He likes to go into bars and beat up innocent Piano Transformer guys because they don't play the music he wants.
Marvel Comics UK continuity
Fang entered Maccadam's Old Oil House in a bad mood. Annoyed that the piano was not playing the music he wanted he started beating the machine up with his pile driver hand, and demanded the poor bot call him "sir", firing a laser from his foot. He beat the piano transformer up some more, then asked if anyone else wanted to take him on.
Twin Twist did. It didn't go too well for Fang after that point.