This is what happened to Jack and Dave.
If you were Jack and Dave, what would you do?
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Just to show what can happen when important ciphers get into the wrong hands, a partial decryption suggests that if Jack and Dave were me, what they would do is look for a lawyer.
What were Jack and Dave thinking!, entering dance bars with A minor. Time to face the music. Apologies to anyone unfamiliar, or too familiar, with music theory, and to the original intent of a yet-undeciphered interesting puzzle.
If we look at the notes, they are
We note that
The second bar has 5 beats, contradicting the common time (4 4) in the first bar. I therefore assume that the bar separates words
This leads me to think that
This is a cryptogram for "seas ease"
And if I were Jack and/or Dave I might
Up anchor and sail away. Or something nautical like that.