Write both chords in four voices: soprano and alto on the treble staff (upper stems up, lower stems down), tenor and bass on the bass staff. Only the first bass note is given. Click a lone note on a staff again to put both voices on it (a unison, shown as one notehead with two stems); click a unison, or one of two different notes, to remove it. Clicking a staff that's full replaces the nearer note. The key signature applies, so a note with no sign follows it; secondary chords usually need an accidental or two. You can also type each chord from the bottom up (tenor, alto and soprano over the given bass, then bass, tenor, alto and soprano), with a space between notes, and b, #, x or n right after a letter when it needs an accidental, then Enter. After a flat, press Space before the next note. If the key signature already flats a note, don't add a flat: a b typed right after it is the note B. The up and down arrows move the last note you placed up or down an octave. Backspace erases the last note.

A secondary chord borrows the dominant or leading-tone chord of another chord in the key. V/x is the major triad (or major-minor seventh) a fifth above x; viiø⁷/x (in major keys) and vii°⁷/x (in minor keys) are built on the half step below x. Its leading tone, the note a half step below the root of x, rises to that root, so don't double it, and a seventh resolves down by step.

Piano sound: Salamander Grand Piano by Alexander Holm, used under CC BY 3.0 (trimmed and converted to mono).

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