Chris Willman Senior Music Writer and Chief Music Critic In case anyone is tempted to think of country music as a one-man phenomenon at present with Morgan Wallen’s seemingly indomitable runs atop multiple charts, Luke Combs has come along to remind everyone that this town is big enough for the both of ’em. They’re now forming a two-man roadblock at the top of the Billboard Hot 100, as, between them, country owns the top two spots on that all-genre charts for the first time in 42 years. Wallen’s smash “Last Night” remains on top of the Hot 100 — no news there, since this is the song’s 14th week at No. 1. But it is a fresh development to have Combs’ cover of Tracy Chapman’s “Fast Car” cruising close up behind it, moving up one spot to No. 2. It’s the first time the genre has claimed Nos. 1-2 on Billboard’s primary chart since March 1981, when Eddie Rabbitt’s “I Love a Rainy Night” and Dolly Parton’s “9 to 5” managed the same crossover-success feat.