Fauxbourdon and Rule of the Octave in Music Theory
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Fauxbourdon Techniques in Harmony
A) Passing Interpolations
These include:
- Descending thirds progressions (IV6-ii6)
- Descending fifths progressions (Haydn)
- Sometimes descending fourths progressions (IV6-I6-ii6)
B) Sorbet: Parallel First Inversion Triads
In the key of G major, a passing connection from IV6 to I6 serves to break the cycle of recirculating harmonies. It's an extravagant way to connect IV6 to the ii6, but it leads to a normal cadence (ii6-I6/4-V-I). Make sure the parallel motion always leads to a recognizable destination (e.g., a strong dominant or a strong cadence). Think of fauxbourdon as a "thickened melody."
C) I6 as a Neighbor to ii6
Mozart's B-flat Piano Sonata ends with a ii6-I6-ii6-vii°6 progression. The I6 functions like a neighbor