“Worry is like a rocking chair,” we’re told, “gives you something to do but it don’t get you nowhere.” That’s the philosophy behind this down-home musical at the Covington’s Carnegie Center where you can get acquainted with the denizens of the Double Cupp Diner. Sisters Rhetta and Prudie Cupp grind through another day, aching for tips and fantasizing about a beach vacation, while the boys fix cars, talk about fishing and cultivate their farmer tans.It’s a feel-good show about the simple pleasures of life along the highway. Steve Goers is the music director and pianist as well as playing one of the “boys”; he’s conducted theater orchestras all over town with good results. The cast also includes Brad Myers, known locally as the lead guitarist of Ray’s Music Exchange and the Steely Dan tribute band, Aja. Through April 29. $19-$26. 859-957-1940.