"Musicians communicate with music, after all"

Why should music students know the German language if they are studying in Germany?
It's a kind of half-knowledge that runs through the world that musicians communicate to their outside world only through music and therefore need little or no knowledge of foreign languages to study music.
The music student must be able to follow the content of theoretical lectures in order to find his way around the "craft of music".
He must be able to pass written and oral examinations.
He will have to complete at least one written term paper or Bachelor's thesis in the course of his studies.
He should understand the explanations of his main subject teacher. This goes beyond mere non-verbal mirroring of the teacher, imitating hand puppet figures or transposing hand signs.
To deepen his studies, he will at least need to grasp easily understandable accompanying literature.
Reading technical literature will also be necessary for a real understanding of compositions or their backgrounds.
A singer in particular must UNDERSTAND the words he sings in order to be able to present them to the audience in a way that makes sense. How can one sing a poem by Goethe or Heine, for example, if one does not know what the words mean? No one is interested in a musical performance that is not penetrated by the content. How, then, is one supposed to earn money with it?
In order to study in Germany, one should have German or at least English language skills that make such studies meaningful and possible.
For a singing student, singing without an accent and understanding what is being sung in the main languages of the repertoire, German, Italian, French, should be a matter of course. The more languages a singer/musician actively masters, the better.
Linguistic communication is not only important for everyday life or for dealing with authorities. It is needed above all to find work/engagements - provided you really want to work as a singer/musician - and to understand the contracts that you then have to sign - if you get them.