The Country Music Hall of Fame and Museum kicks off its summer Hot Nights in the Hall series with a show dedicated to the pioneering Music City rhythm-and-blues performers featured on the Night Train to Nashville compilations. Those collections spotlighted a lot of great music that had been overlooked — and much that had gained worldwide fame — while the CMHOF’s accompanying exhibit was a milestone that brought long-overdue attention and respect to the city’s R&B heritage. Tonight’s show features such legends as Buzz Cason, who co-wrote Robert Knight’s 1967 hit single “Everlasting Love.” Knight will perform, as will The Valentines, Frank Howard, Herbert Hunter, Mac Gayden, DeFord Bailey Jr. and Marion James. They’ll perform classic Night Train material backed by a house band led by Jimmy Church. These performers haven’t played together here since the Hall of Fame’s 2004 Night Train exhibit closed, so tonight’s gathering is a long-overdue reunion — don’t miss it.