In the opening scene of Meredith Willson's The Music Man at Marriott Theatre, a train car full of traveling salesmen showcase their talent and precision as they fast-talk and sing their way through the opening number, "Rock Island" (aka the "Ya gotta know the territory" song). The salesmen, each identified by a different company name […] The post <i>The Music Man</i> at Marriott knows the territory appe…