Joshua Hedley is “a singing professor of country & western,” he declares on his raucous and witty new album, Neon Blue. It might sound like a punchline, but it’s not. An ace fiddle player, a sharp guitarist, and a singer with a granite twang, he’s devoted his entire life to the study of this genre. Ask him about it and he’ll explain: “When all my friends went off to college, I went to Nashville. I was 19 years old playing honkytonks and getting an education.” His 2018 debut, Mr. Jukebox, showcased his deep knowledge of country’s history, in particular the beery ballads of the 1950s and ‘60s. His mentors were George Jones, Ray Price, and Glen Campbell, but his most remarkable accomplishment was putting his own spin on their style.