I have several interlinked questions about mood and performance. Let's say Alice is scheduled to sing at a concert, but is in a bad mood for some reason (e.g. she just found out her husband is cheating on her, she got pulled over by the traffic police while on the way to the concert, and so on).
- Is her ability to perform likely to be impacted? If so, by how much?
- Has a concert ever been cancelled because the performer wasn't in the mood to perform?
- Suppose Alice is part of a larger choir or orchestra. Can the performance go on without her? Is it common?