My biggest musical moment was probably 30 years ago. In grade 8 me and two friends decided to enter the school talent show. I played 6 string my one friend played bass and the other friend was on drums. We did an instrumental version of Yesterday and won the talent show.
My most recent was when I played, and sang, Old Man straight through from memory. I've never been able to play any song without having the sheet music there to guide me. Doesn't seem to matter if I play a song a 100 times it usually doesn't stick in my head. Always needed the sheet music right there or I'd get lost.