Theres a huge amount of info from great sources pointing at each of the trio you mentioned.
Seems unlikely to change at this point. It has been exciting leading up to this though!
Except it hasn’t been very specific, at all.
1960s it was a jazz festival.
Early 1970s it was primarily a progressive rock, blues rock and hard rock festival.
Late 1970s/early 1980s it started to introduce punk rock and new wave acts.
Late 1980s saw the festival attempt a mainstream commercial pop direction.
Early 1990s the festival returned to primarily rock music, with grunge, bet pop and rap becoming popular acts booked.
Early 2000s saw a varied, predominantly rock lineup, but did book major metal & hip hop acts.
Mid 2000s to early 2010s focused on the new indie bands alongside stuff they booked in the early 2000s
It has never, in its history, had a very specific aesthetic lasting 50 years.
Wanted to join in the chat but busy day at work. If I get a lunch break I'll join in the fun but at this rate I'll be working till nine in the afternoon.