Abstract: A method and associated systems for real-time analysis of a musical performance using analytics. A performance-analysis system receives feedback from which may be inferred an audience's reaction to the performance. This feedback may be derived from sensors embedded in instruments or microphones, from video-input devices that visually represent the audience's body language and facial expressions, and from performance ratings and natural-language comments submitted by audience members to a social-media network or performance-rating application. An analytics engine of the performance-analysis system uses methods of artificial intelligence to infer the audience's emotional state from the received feedback and to determine whether certain characteristics of the performance are undesirable. The system represents these inferences as a value of a performance index and represents the index value to the performers.