From 2014-16, which is what I have to pick from:
Arcade Fire - my first headliner, the first time I really got the scale of the pyramid crowd, and it was a banger.
Robert Plant - never thought I would hear Led Zeppelin songs performed live. Got to do it standing in a puddle with my cousin, who I randomly found there.
tUnEyArDs - my first "discovery" at the festival, went to see Jurassic 5, and TuneYards was on before. Spent far too long trying to figure out what the sparkly eyes were flashing on the West Holt actually were.
Lionel Richie - culmination point of an epic weekend with a great bunch of mates, tired, dirty and happy, singing along in the sun. Lionel Saves.
Art Garfunkel - another one I never thought I would see live, had a bit of a cry listening to him perform old Simon and Garfunkel songs, thinking about my dad.
I've missed so many.