It's Greek to me.

I know you're joking, but sheet music is sheet music. It's a valuable resource for someone who wants to learn the songs, or just analyze how the melodies work, even if they don't know the Greek alphabet. I've listened to Rosa's recordings, and I find that kind of thing fascinating but hard (for me) to work out by ear. I could see myself trying to stumble through it on a melody instrument, just for my own amusement.