Sky Arts had this on a loop about three years ago and it pointed the direction in which pop music was heading.
Large open air venues (with, in not too many years from '69, a hefty price tag attached and the attendant merchandise) and largely uninterested and uninspired acts on stage.
Personally I can live without Clapton after about 1964, but Stevie Winwood.....what happened?
Three years before Blind Faith he was doing 'Keep On Running', 'Gimme Some Lovin'', 'Somebody Help Me' and 'I'm a Man' in small, intimate R&B clubs.