I'm not sure I understand what your project is exactly, but maybe you could research how music affects mood? Perhaps look up articles that explore how different styles of music (rap, rock, classical, and pop for example) affect people, and then play games and compare your performance with what you would expect based on the research findings.
Then again I'm not totally sure what you're saying here, so I apologize in advance if I'm way off.
Hopefully my suggestion will at least give you a few ideas. Good luck!