The guys from Old Dominion—Matthew Ramsey, Trevor Rosen, Geoff Sprung, Brad Tursi and Whit Sellers—scored their eighth No. 1 single this week as “One Man Band” ascended to the top of both the Billboard Country Airplay chart and Mediabase chart. Penned by Josh Osborne with Old Dominion’s Matthew, Trevor and Brad, “One Man Band” fits…