I defer to all the resident Ra-experts but as someone who's dipped a toe into each decade of the discography (courtesy of Evidence, ESP, Delmark, Leo, Impulse) I've found afew of the Art Yards an intriguing listen, nicely produced. So whilst it may not be the place (is there ever really one ideal entry into such a vast musical world?) to start I'd say it was a tempting box for a flavour of an era.
From thereon in it's all bets off though....