Elvis might have compromised his musical style a bit towards the end, but that doesn't mean that artists from the rock n' roll/folk-roots culture - of which he was not really a part - shouldn't get better as they get older, like the great jazz or blues artists.
Bonnie RaittThere would be no rock and roll or rhythm and blues without Leo Fenders' contribution ... the tone is everything
Bonnie RaittOne of the things that I'm glad about, though, is that regular people can relate to me.
Bonnie Raitt