Mozart and the Diatonic Functions

Just 2 videos showing what the diatonic functions (Harmonic function) are.

A diatonic function (also chord area), in tonal music theory, is the specific, recognized role of each of the 7 notes and their chords in relation to the (diatonic) key. "Role" in this context means the degree of tension produced by a moving away to a note, chord or scale other than the tonic; and at the same time "how" this musical tension would be eased ("resolved") towards the stability of returning the tonic chord / note / scale (namely, "function").
Each degree of the seven-tone diatonic scale has a name that relates to its function. The major scale and all three forms of the minor scale share these terms."
—Benward & Saker[2]
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