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What to study before Sixth chords

A sixth added to the triad, which sounds like rest where a major seventh would sound like colour. Below, the concepts that come before, in the order in which one explains the next. Signed in, you see the same path minus what you already hold: your path.

Properties of sound
The four properties every musical sound has at once: duration, intensity, pitch and timbre.
Level 0has practice
Note
The seven pitch names, and the sign that puts one of them on the page.
Level 1
Tone and semitone
The smallest distance Western music uses, and the whole tone built from two of them.
Level 1has practicelesson Notes, semitones and the rule of names (Harmony for people who play)
Interval
The distance between two sounds, counted by note names, melodic or harmonic, simple or compound.
Level 1lesson Intervals, in number and quality (Harmony for people who play)
Interval quality
Perfect, major, minor, augmented and diminished: what separates two intervals that share a number.
Level 1has practicelesson Intervals, in number and quality (Harmony for people who play)
Triads
Three-note chords stacked in thirds, and the four qualities that result.
Level 2has practicelesson Four triads, and the third that decides (Harmony for people who play)
Seventh chords
The fourth note stacked on the triad, and the five qualities the repertoire actually uses.
Level 3has practicelesson Seventh chords, and the tritone that pulls (Harmony for people who play)
Sixth chords
A sixth added to the triad, which sounds like rest where a major seventh would sound like colour.
Level 3lesson Rest with colour (Chords beyond the triad)