People like to complain about how low-brow culture has become. The radio is cluttered with profanity-laden hip-hop tracks, misogynistic rock songs, and club hits dripping with enough sexual innuendo that they'd glow under a black light. But all of this longing for the "good old days" is usually based more on selective memory than it is reality. Case in point, Mozart's song "Leck mich im Arsch".
If you can't guess the translation based on the title, it's basically "Lick me in the Arse". Most scholars believe that this was a party piece that he wrote for his friends' amusement. A sanitized version with drastically altered lyrics called "Let Us Be Glad" was published after Mozart's death. It wasn't until 1991 that the original manuscript was unearthed and we all learned what a dirty bugger Mozart was.