This is what happened to Jack and Dave.
If you were Jack and Dave, what would you do?
run the other way for a(a) bee(b), they see(c) a(a) bee(b) see(c) a(a) beeeeeeeeee(b)
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.