Secondary 7th Chords in Major, Part 1 (Harmony III.10)

We have studied several concepts, or guiding principles – “Rules” – that pertain to Dominant 7th chords. These will prove useful as we now add several Secondary Seventh Chords to our Contrapuntal-Harmonic Tool Chest.
Though everything presented herein can be transposed to the 14 written Sharp and Flat Keys - which university students would normally have to do in workbook assignments - our discussion today deals only with chords of the key of C Major. [Continued on Video]

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REFERENCES AND IMAGE CREDIT
Manual of Harmony, pp. 66-67, by Dr. Salomon Jadassohn. Breitkopf and Hartel, 1890. Public Domain; no copyright.
Internet Archive Link – copy url, paste into browser window, download Manual of Harmony: https://archive.org/details/manualharmony00pasmgoog

Tool Chest, by Charles & Hudson (mods & commercial use allowed; downloaded 17_11_04): https://flic.kr/p/8VpeeK
License info: https://creativecommons.org/licenses/by-sa/2.0/
Creative Commons License: https://creativecommons.org/licenses/by/2.0/legalcode