I would say that in general we should stick with using tags in English, except in the case an Esperanto word is more appropriate because it expresses a concept that is otherwise difficult to express with an English word.
I would rather avoid using volativo and muziko.
Keep in mind that EL, like many other Stack Exchange sites, is an English site. Questions in Esperanto are allowed, but the site language is still English. The site is not even prepared to handle diacritics in tags, and probably also the algorithm to detect low quality questions need to be calibrated for a language different from English.