Chuck Berry: "...when you sin, go ahead and sin."

But if you like all music, then variety adds to the performance. We'd do "Day-O" ["Banana Boat Song"] by Harry Belafonte, "Jamaica Farewell," then jump back with some Muddy, then some sweet Nat. No spirituals, though. I always say, when you sin, go ahead and sin. When you ask forgiveness [laughs], you know-keep it separate!

Doerschuk, Robert L., ed., Playing from the Heart: Great Musicians Talk About Their Craft, San Francisco: Backbeat Books, 2002, p. 7.