I didn't know the band either, but found a synonym for best from the crossers and googled them. If I am right, however, then what is 'way back' doing in the word play?
Thanks, I'll give it a go!
However I think I need to retire defeated on this puzzle as there are a number ( like 18A or 1D) where I have a plausible definition but unable to parse. Hey Ho, time to move on!
It is a pretty obscure theme I agree. I found it easier to just complete the grid then afterwards find all the references some of which I have no doubt missed. Kind of makes you wonder what is the point, maybe some sort of anniversary.