Sean Patrick McGraw is “that guy” in tomorrow’s episode of “Nashville.” His single, “I’m That Guy,” will be premiering Wednesday, Oct. 1 at 10/9 p.m. CST during ABC’s “Nashville.” It can be heard in the background during the scene featuring character Juliette Barnes, played by Hayden Panettiere, shopping. The single is off of McGraw’s forthcoming album “Hard Way to Make an Easy Living.” It’s been quickly climbing the charts since its release, fast becoming a favorite on the r