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A puzzle centered around tunes, melodies, operas, famous song texts, composers, orchestras, and/or musical instruments. General music questions are off-topic here but can usually be asked at the Stack Exchange sites for either Music Practice & Theory or Music Fans.

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Partial answer If you decode every QR code using something like zxing.org, you get these codes (top to bottom): 1 2 3 4 Credits Gareth McCaughan♦ spotted a mistake.
answered Jan 11 '18 by R.M