There are two issues with wordcloud when listening to classical music (cf. attached capture).

1. Tags tend to have many short words or abbreviations which are meaningless when taken out of context. For example : "iv" (fourth movement), "ma" (as in "allegro ma non troppo"), "d" (as in "Fugue in d minor"), "op" (as in "Opus 2"), or any digit or number, which are very common (e.g. "Symphony no. 5" — also notice the frequency of "no" in the attached capture).
2. Some terms use accented characters, mainly from French, which are not rendered properly (e.g. "étude" becomes "tude", "exécution" becomes "excution"). Although I haven't checked, this would also be the case with widely used German titles containing accented characters (e.g. "Verklärte Nacht", "Die Zauberflöte", "Götterdämmerung").

Proposed solutions:

1. Easy: add an option to ignore numbers and words shorter than a given length. More involved: add an option to ignore italian musical terms (cf. http://www.musictheory.org.uk/res-musical-terms/italian-musical-terms.php).
2. Add support for accented characters/Unicode.

Wonderful stuff otherwise!