On the other hand, there are songs that fall foul of censors even though (because?) they are incomprehensible (and actually innocent). Like Louie Louie and Woolly Bully. But reverting to the topic, how did Cab Calloway get away with the continual drug references in his songs? And I've got a pre 1920 78 of Casey Jones, in which Casey's widow tells the kids 'now don't you pine, You got another pappy on the Cunard Line' (the whole song is performed in a particularly joyous style). References to adultery and illegitimacy were not common in 'pop' songs of the time. And then again, there was Marie Lloyd somehow getting away with changing 'She sits among the cabbages and peas' to 'She sits among the cabbages and leeks' after an objection...