What the song is about: the cynical rules of getting ahead
Du mußt ein Schwein sein addresses an unpleasant rule of social survival: kind and honest people are often left behind while brazen, cynical people advance more quickly. The title sounds like deliberately bad advice, suggesting that success sometimes demands a harder character.
How to learn German with Du mußt ein Schwein sein
This is material for confident B2-C1 learners, with plenty of sarcasm, streetwise allegory and forceful colloquial language. It offers practice with the modal verb müssen, the older spelling mußt, the metaphor ein Schwein sein and rapid spoken passages delivered by the chorus.