J. Pachelbel's wonderful "94 Fugues on the Magnificat" are divided into 8 sections, each one titled "Magnificat primi toni," "Magnificat secondi toni," etc, all the way to "Magnificat octavi toni."
For years I have tried to figure out what these titles mean. They don't seem to be scale degrees in stepwise motion since the first set of fugues begin on "d", the next 2 sets on "g", then on "f" and so on. The first notes don't seem to be spelling out the melody of a chant either.
I am thoroughly confused. Can anyone explain this?
The 'toni' designations refer to the modes of the Gregorian psalm tones. Primi toni (Mode I) is re-re, re final, aka Dorian mode (Authentic); Secondi toni is also re-re, but with re in the middle of the range (Dorian mode, plagal). See this webpage for a very plain explanation: http://graham.main.nc.us/~bhammel/MUSIC/Cmodes.html
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