Playlist, Legacy Recordings’ series of single-disc anthologies spotlighting “The Hits plus the Fan Favorites,” keeps on rollin’ with a new, typically eclectic group of artists covering a wide swath of genres and styles.  Today, May 21, Legacy releases volumes in the series dedicated to the best of R&B (Diana Ross, Donna Summer), pop (Billy Ocean), country-and-western (Chet Atkins, Patty Loveless, Restless Heart, Mindy McCready), Latin jazz (Tito Puente) and the many strains of rock (Southside Johnny and the Asbury Jukes, Warrant, Jeff Buckley, Switchfoot, Iggy Pop).  All Playlist titles are now housed…