My choral singing started at primary school, where I was in the choir. We enjoyed singing, which was supposedly unison singing. However, the teacher spent a lot of time prowling around trying to find a "boy who was singing harmony".
The day of the school concert came, and we were part of this. We were marshalled in an unfamiliar classroom, which belonged to an older year. I was pleased to find some new books, including "So you want to be....a Librarian". This was much better than my own classroom, where the only career options for girls were Nurse or Teacher. I picked up the book and was soon engrossed in the exciting world of the Librarian.
After a while, I realised the noise level had dropped. Indeed, there was no-one but me left, which was odd. I emerged to find the concert was over and my mother was wondering why she had had to come when I hadn't featured at all.
Since then, I've kept a closer eye and ear on my fellow singers and haven't (as far as I know) missed another performance.