It’s just after noon on a sunny day in early March. At the corner of Toulouse and Royal Streets tourists mill about. They pause to look in the antique shop windows, sniff soap samples and sip walking beverages. On the curb, Tuba Skinny are just finishing their lunch break. They eat the last few bites of bananas and sandwiches from Rouses. Tupelo, Barnabus the trombone player’s dog, eats leftover bacon. Shaye Cohn makes the...