I was just watching my U2 In the Round video, California.
What an incredible guitarist The Edge is. As well as playing left-field guitar (and unerringly able to create iconic riffs) he is a blinding backing vocalist. He is the sound of U2 !
We never speak of them here. I doubt they would headline Glastonbury/Reading. Perhaps there is one band that is so big that we can't see them.
(My wife's boss tried to book tickets and had secured some, by the time he'd cleared his credit card they'd gone. £180 each !!!)