I went to a children's performance today with my kids by Cha Cha Sam. The last concert was a long long time ago, and I don't even think I can remember. Perhaps the Whirling Dervishes of Konya performance (wouldn't count as a concert).
OK, a 'concert' for me means 'live music'! Then there're plays, shows & musicals.
In that case my answer is a Symphony Orchestra performance of Vivaldi's 'Four Seasons', as well as Astor Piazzola's 'Four Seasons of Buenos Aires'.
Then went to listen to Countertenor, Max Cencic sing a Baroque Repertoire.
You lucky girl going to a Leonard Cohen concert. I bought his LP the 1st time i heard him, as a teenager. I thought he was wonderful, strange words, yes! I don't think I've been to 1 since I took our eldest daughter to see WHAM, in her early teens! As a teen myself, I did go to a Rolling Stones, & a Beatles concert & I did also see Elton John, in concert. that's all i can remember at the moment!