The whole network draws one chord a day from a single seed. The instrument sites show you where to put your fingers for it. This page asks the only question a chart asks — what number is it? — and because that question has twelve answers at once, the round here is the whole twelve-key reading rather than a single fact.
The point of a daily pick is not the chord. It is the habit: one small thing, in a fixed place, every day, for as long as you keep turning up. Today a sister site is drawing this chord on a neck while this page is working out that it is a plain digit in seven keys and a flattened one in the other five.
How to read the round
Seven of the twelve keys contain today's root in their own major scale, so a chart in those keys writes it as a plain digit between 1 and 7. The other five do not, and a chart there reaches for an accidental — b2, b3, #4, b6 or b7, the conventional spellings and never the arithmetic ones. Which five depends only on the root, so the split is the same every time that root comes up.
The second line under each key says whether the chart is confirming the key or overriding it. On the degrees where the key's own scale already gives this quality, the mark is agreeing with something the reader could have guessed; on the others it is the writer insisting, which is worth noticing because those are the chords a room gets wrong.
Some days the pick is a quality no chart carries — a major seventh, an added ninth, a suspended second. There is no mark for those, so the round says which mark a writer would actually put on the page and what it leaves out. That disclosure is the point rather than an apology: a chart's job is the harmony a player cannot guess, and the rest was always going to be somebody's ear.
Where the pick comes from
One seed, shared by every site in the network, turning over once a day. Nothing is personalised and nothing is chosen by anybody: the date decides, identically for everyone. The calculation runs in your browser against your own local date, which is why the text you are reading describes the round rather than naming a chord — if it is still yesterday where you are, you should be looking at yesterday's chord, and you are.