I would have to say today, so Ill pick the 90's. I think the 1980's started out with a lot of promise...but lost its way musically around 1984. I think after Michael Jacksons Thriller went massive, other artists wanted to emulate the success of Thriller, and, as such, over produced their music. I loved Toto's Africa, Hall annd oats' Kiss On My List and (I think it was Split Enz's) Six Month In A Leaky Boat. I also loved Twisted Sister.
That being said, though, I think, as far as originality goes, the 1970's was the last time music was truely original. Disco (I know people dont like it much now, but I love it)and Punk were awsome and original...And Rap began to become mainstream.
So...90's (and today) the music SUCKED(S) big time.
The Best decade for music was the 1970's.
70's Music Lover