When Detroit Brooks walks through a door—of a church, a club, a coffeehouse—he’s greeted with smiles, hugs, handshakes and kisses. Though the New Orleans native is renowned as a fine guitarist, banjo player, vocalist and composer, Brooks also boasts a reputation for being just a really nice guy. When asked if he has any enemies, he humorously answers, “I don’t seek ’em,” and quickly adds, “I don’t know anybody who has or s...