Shave and a haircut, two bits

One of the reasons I love what I do is the unmitigated delight of being surprised by music; whether it's a workman whistling a tune I've never heard before, a party celebrating a wedding, or grieving family mourning a bereavement, every now and then, the music just bursts out in a spontaneous expression of our humanity no matter where, or when, in the world we live.
Throwing in my lot with Jacob Smollett and his granddaughter Amelia, on their way down to Wilmington delivering farm produce to Bencher's chandler has been enjoyable, but not particularly profitable. Old Mr.Smollett has admitted to knowing several songs which he has no intention of teaching young Amelia and Amelia has taught me a couple of interesting, but generally unremarkable schoolyard songs.
While Jacob fine-tuned the details of his deal with Captain Bencher, Amelia and I watched the longshoremen shouldering and carrying barrels, bales, and crates up the gangplanks to the Caroline. For a while, Amelia was held spellbound by the noise and smoke of a steam-powered derrick working further down the quay but the quay is a working environment, with heavy loads, strong men, and powerful machinery at work, and I was able to deter her from trying to get a closer look.
Lunch break for the longshoremen doesn't happen at 12 noon sharp; these men work until the ship is loaded or unloaded, one or two men taking a break at a time, as needed under the watchful eye of the bo'sun. By three o'clock the Caroline's cargo had all been loaded and the ship was only waiting on the harbour pilot and the tide.
With an hour or so before they would be needed again, a small group of stevedores had settled themselves on a stack of woolen bales and formed an impromptu choir. What surprised me was that these men (three negroes and two white men) were improvising what I would have termed barbershop harmony and their performance was in no way blemished by the occasional discord:

The youngest member of the group had a question about rhythm:
“Perfesser, yes'day you tole me you can write music down, on paper, same as writin' on paper? kin you show me how?”
“Well now, young Amos, let's take a real simple example – ‘shave an' a haircut; two bits’, I would write that like this:”
And taking a pencil and a scrap of paper from his pocket he jotted down the following sample:

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