... questions that could be answered by consulting wikipedia or youtube, elementary courses of music etc?
In another group I have found this restriction for put on hold: "This site is about the usage and rules of the German language. It is not well-suited to replace a dictionary, thesaurus, or conjugation table. If you have already consulted such sources and still have questions, please edit your question to explain what you found and why it did not help. See this post on Meta for more information."
I think there should be a similar "warning" that prevents for asking questions that could easily be answered by consulting first wiki, or a side link with basic information to music theory as: the name of the notes, staffs, clefs, scales, chords, circle of fifths and elements of rhythm.