“Music and Mardi Gras” begins in New York with Tom Piazza, author of “Why New Orleans Matters,” playing recordings that show us why New Orleans matters to him. Next, we are transported to New Orleans, listening to the same songs with Gregg Stafford on his porch. Stafford is a staunch proponent of New Orleans’ traditional music and occasional bandleader at Preservation Hall. Mardi Gras “Indian” songs elicit their feelings about having a Mardi Gras in the wake of Katrina. The piece features music by the Silver Leaf Brass Band, Danny Barker and the Wild Tchoupitoulas.