The knowledge of music doesn't include the duty of knowing every Lithuanian artist, but ability to recognize musical style, composition, instruments and vocalization techinque irrespective of whether you know a specific song or artist. That's actually how schools of music conduct tests and grade students in theory of music.
As we both agree that she belongs to the musical style created in the French 20's, I guess you proved my point. The only point of disagreement here is that you think everybody should like what you like, no matter how many times we heard the same thing (and are tired of it). Merci beaucoup, madame.