Generative Adversarial Post-Training Mitigates Reward Hacking in Live Human-AI Music Interaction - Wu, Yusong; Brade, Stephen; Ma, Teng; Fowler, Tia-Jane; Yang, Enning; Banar, Berker; Courville, Aaron; Jaques, Natasha; Huang, Anna (International Conference on Learning Representations, 2026)