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I just started learning about species counterpoint, and I thought one should only use (for both cantus firmus and counterpoint) the natural keys of the scale (diatonic) until I saw this G minor example:

CF (part of it) at the bottom

So my question is, when to change to harmonic or melodic?, can you do this in both CF and counterpoint?

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    Small point, but both F and F# occur in G melodic minor. – Tim Aug 28 '17 at 5:55
  • So let's say I had to write an excercise in "G minor", do I have to use F or F#? that's the point I dont get, is it up to me or what does it depend on? – mgblc Aug 28 '17 at 6:44
  • Generally speaking, the melodic minor is formed with raised leading note and raised 6th when a melody is rising, but when it is going down, both the 6th and 7th notes revert to those of the relative major. In the Gm example, those notes are E and F# going up, and Eb and F going down. it was considered at the time that the 3 semitone gap between natural 6th and raised 7th as in harmonic minor was too great. I've tried to put this into laymans' terms. These days, it's more of a question of what actually sounds better. – Tim Aug 28 '17 at 7:11
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In some sense, writing strict species counterpoint in a modern "minor key" is an anachronism.

Really, you ought to use one of the 8 Church Tones which were based on the medieval plainsong modes - some of them transposed, and written with modern-looking key signatures of one or two flats, but not conceptually the same as the modern ideas of "D minor" or "G minor". This system was more or less standardized across Europe in the Renaissance and Baroque periods, and is what Couperin meant when the title of a piece mentions the first to eighth "Ton," the Spanish composers by "Tono," etc.

The tonality of this music was not so sharply defined as in the classical era - it would be more accurate to say the music used any of the "well tuned" chords in meantone temperament, and "modulation between different keys" was not recognized as a concept - successive cadences were often in what appear to be different "keys" but the "modulations" don't have much structural function in defining the form of the complete piece.

This little history lesson doesn't entirely answer your questions, because the "leading note" of the "Ton" was often (but not always!) sharpened to be a semitone below the tonic, especially at cadences. On the other hand, for music that was not strictly contrapuntal or liturgical, Renaissance keyboard composers were quite happy to write F# and G# in one hand simultaneously with F and G natural in the other, in the key of "A minor," especially if the notes were separated by 2 octaves - though writing like that probably won't get you good marks in a 21st-century examination! (Meantone temperament softens the effect compared with modern equal temperament, and the resulting clashes don't sound like "discords" at all once you get used to them.)

Another way to approach this question is to stick to the notes that were "in tune" in Meantone temperament - i.e. C C# D Eb F F# G G# A Bb B in the normal tuning with key signatures of 1 of 2 flats - though sometimes G# was retuned to Ab if the tonality ventured somewhere close to the modern C minor.

Here's a brief history lesson: http://www.kholopov.ru/arc/atcherson.pdf

  • So, if I wanted to write a "Renaissance-like" counterpoint excercise (with a tonal approach) in minor mode, I have to stick to the notes of a natural minor scale right? – mgblc Aug 28 '17 at 15:27

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