Although I consider myself an oldies guy I'm often struck by the overwhelming quality level of 70's music in all the sub-genres (disco notwithstanding ;) ).
And your phrase, "...unlike many of today's artists and entertainers..." quietly defines much of why that decade outshines the subsequent ones IMO.
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins