Every Warrior site draws the same chord each day from one shared seed. The instrument sites show you where to put your hands on it. This page asks the only question this idiom asks of a chord somebody has just called: what is it doing here.
The answer takes the form of two bars. Today’s chord is placed in the cadence it most naturally belongs to — as the supertonic, the dominant or the tonic of some key — and then the same two bars are shown a second time with one substitution applied to them by the site’s own engine. Both readings are computed in your browser, which is why the text you are reading names no chord.
Into the changes
A chord makes sense in a progression. Work the movements in the changes, play them through the standards, see what each player in the rhythm section takes, or open a seat's charts: guitar, upright bass and piano.
How the placement is decided
A chord quality is reduced to the largest familiar chord hiding inside it — a ninth is a seventh with a note on top, a sixth is a triad with one — and that reduction decides the job. A dominant seventh takes the dominant’s place and the key is a fourth above it. A minor seventh takes the supertonic’s place and the key is a whole tone below it. A major seventh or a plain triad is read as the tonic and the key is its own root. Every one of those relationships is arithmetic over the same table of scale degrees the rest of the site uses.
Some days the pick has no third of its own, and then it names no job at all. The reading treats it as a tonic and says so on the page rather than quietly guessing — the same disclosure discipline the reduction ladder was written for on a sister site, reused here for a different question.
Why the second reading is a tritone away
The rule applied underneath is the tritone substitution, chosen because it is the one move that changes a cadence audibly while changing almost nothing about what is sounding: the two notes that carry the pull stay exactly where they are, and the bass slides down a semitone instead of dropping a fifth. The widget names the two shared notes, computed from the interval tables rather than asserted.
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 against your own local date, which is why this page describes the ritual rather than naming a chord — if it is still yesterday where you are, you should be looking at yesterday’s chord, and you are.