haven’t read the whole thread so apologies if already said, but trying to pin it to an artificial ten years is pointless, just as defining seasons into packets of three exact months.
The best decade for music was from sometime in the early-mid 80’s to the early mid-90’s. So that’s basically from The Smiths and Indie Pop / C86 / taping John Peel under the bedcovers through to when Britpop started to take itself too seriously, capturing Madchester / the baggy-rave scene sometime around the middle. And even then a decade isn’t quite enough, because if you throw your ten year blanket from say 85-95 then you miss the beginning of the Smiths, Joy Division->New Order, and at the other end the rise of DJ’s as artists and electronica.
And that clearly misses out the great like the Beatles, Stones, Doors, VM, and so many more.
So in essence, you’re all wrong, as am I. There is no greatest decade, only great decades.
(alternative answer – any decade with the Wedding Present in it. So far that covers 80’s to 10’s and still counting, despite all the songs sounding the same)