Here's my take FWIW
'50's -innocent and joyous (2nd place in my book)
'60's -pop music was finding its identity
'70's -This is the ultimate decade for music, for reasons too numerous to enumnerate
'80's -overall... too silly (but still good enough to rate 3rd in this informal poll IMO)
'90's -music became way to morose and self-important
'00's -hip hop? errrrr no thanx (music is so forced now)