PHILADELPHIA (AP) — Paul McCartney can read an audience well enough to know when changing one word in a song can win them forever. McCartney gave a private performance in Philadelphia last weekend at the American Trucking Association’s Management Conference and Exhibition. The industry newspaper Transport Topics reports he did “Drive My Car” by singing, “Baby you can drive my truck.” McCartney’s wife, Nancy Shevell, is an executive at New England Motor Freight, a trucking company owned by her family.