It’s concerts that provide the evolving artist with the perfect platform to do both, old and new. I’ve seen Neil Young live four times between 1987 and 2016 and yes I’m a huge fan but each concert was brilliant because of the performance and the song structure of the set. Neil always throws in four maybe five new songs in a set lasting usually up to about three hours. Last twice I’ve seen him he’s does an hour solo acoustic set which includes piano, banjo and pump organ, then around two hours with the band. Some new songs are acoustic or band structured but you get a great mix with all the fans favourites mixed in. Over so many years some of the new ones from years back have become favourites the fans shout for at later gigs, that’s the strength and longevity of the evolving talented musician IMO.