Thomas Rhett, Jason Aldean, Zac Brown Band Set for Summerfest 2019; Vince Gill’s National Anthem at Game 2 of Nashville Predators’ Playoffs; Michael Hobby and Wife Caroline Hobby Are Expecting; Ringo Starr, Lee Ann Womack and More Guest on Rodney Crowell’s TEXAS; Willie Nelson and Annie D’Angelo’s “Happy Birthday” for Margo Price