The horst-wessel-lied is a song that some people in Germany used to sing a long time ago. It was named after a man named Horst Wessel who was part of a political group that believed in some very bad things. The song was a way for these people to show that they supported their beliefs.
However, the song has a very complicated and controversial history. Some people think that it is a song that promotes hate and violence. Others think that it is just a piece of history that should be remembered.
Either way, it is important to know that singing this song today is illegal in Germany because of its association with the bad and dangerous beliefs of the group that Horst Wessel was a part of. It is important to always treat others with kindness and respect and to speak out against hate and discrimination.