If The Syn is known today at all, it’s because the band provided one of the starting points for Yes: Syn members Chris Squire and Peter Banks were two-fifths of the original 1968 Yes line-up. Now, Cherry Red’s Grapefruit imprint is setting out to give The Syn its due with a new compilation.  Flowerman: Rare Blooms from The Syn 1965-69 features all four of the band’s single sides originally released in 1967 by Deram Records plus previously unreleased tracks and rarities. The Syn evolved from The Selfs, a Wembley R&B band formed…