Ive mentioned on here before (so sorry if you have already read) - they probably look like they should have been headlining the Other stage next year. but they have not yet released the (very much ready 3rd album). and it looks like while Matt has had some serious health issues they are putting there planned schedule back. Hopefully the chance of a big big slot at Glasto ship as not sailed and Id expect them to pop up for at least a DJ set next year.
I've been to the last 23 Glastonburys, I barely remember three years ago 😄 but some that pop into my head that left an impression:
Bowie
REM
Metallica
The Who
Macca (first time round)
haha to be fair on one of those Im with you but never got as far 2013 was my first Glastonbury so most of the group were well excited to go to the Arctic Monkeys......... Me and one mate had a a great time watching Django Django in the park then catching Hot Chip DJ in the rabbit hole - (had no prior knowlege of the secret venue just went for a pint and got led astray) no regrets