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Nazi songs were songs made for the Nazi Party (NSDAP) of Germany.
Some songs used by the Nazis are very old, and so these songs are often thought of as to be a Nazi song. An example would be Deutschlandlied, which was written in 1841. The Nazis used the Deutschlandlied with the Horst-Wessel-Lied. Same with the song Die Wacht am Rhein, which at that time was almost 100 years old.
Now in Germany, it is illegal to sing any of these songs, and if you do, the punishment might by up to 3 years in jail.
Es zittern die morschen Knochen was made by Hans Baumann, was a very popular Nazi song. The song was the official song of the Hitler Youth: which is why there are some attacks on the old people in the song. Many Germans know some of the song, but a lot don't know the full song.
Below is the order of how the full song would be sung.