Two recent releases by Sam Bush and Ricky Skaggs — two superstars of Americana, roots, and bluegrass music — show both artists coming home in ways that bring them full circle with their own artistic travels. Bush’s Circles Around Me is a return to the bluegrass and early progressive newgrass of his youth in Bowling Green, Kentucky.  The album opens with the title track, a tune that celebrates “being thankful that you’re here” according to Bush.  His terrific road band — Byron House on bass, Chris Brown on drums, the amazing Scott Vestal on banjo and Stephen Mougin on guitar — plays on the majority of the 14 tracks, stretching out their musical chops on tunes such as the instrumental Blue Mountain and the old New Grass Revival song Souvenir Bottles. This latter tune, along with Whisper My Name written by original NGR bassist Ebo Walker and featured on their very first album, brings Bush back to the band where he made his name and helped shape a whole new genre of music — Newgrass. …