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Why do we only have Major and Minor keys?

Posted by evo 
Why do we only have Major and Minor keys?
July 16, 2020 09:19AM
So why do we only have Major and Minor keys?

What about diminished and augmented keys?

Re: Why do we only have Major and Minor keys?
July 16, 2020 08:17PM
Hi; im not sure as whether there are musical pieces written in keys other than either major or minor; theoretically perhaps, it could be thought of a piece whith starting and ending chord being a diminished (or augmented) chord. It may be the case that there are so many (indeed, infinite) different ways to develope a piece starting either in a major or minor chord, that historically those keys had attracted the main effort by composers and music artists of all time, so to speak. Greetings
Re: Why do we only have Major and Minor keys?
December 21, 2020 06:25PM
It's mostly historical. Gregorian Chant was written without much thought given to keys or the like; it was melodic only, but there were traditional composition procedures. Later, people tried to classify chant as to its characteristics; some chants were clearly related in style and form. This procedure gave rise to eight modes comprising four ending notes (D,E,F,G) and ranges basically D-D or A-A and E-E and B-B and F-F and C-C and G-G and D-D. Amusingly the note Bb was in existence by the time this classification was made. The F mode sometimes had a Bb which made it equivalent to a (hypothetical) mode on C.

As music underwent changes, more modes were suggested and pieces could have parts written in other than their beginning modes; this led to the addition of more notes like Bb (Eb to start with, etc.) In parallel with this was a 6-note pattern called the Hexachord system (it's worth reading the Wiki on hexachords. It's complicated and more so when combined with the chant modes,

During the 1300-1500 time frame, harmonic concepts were expanded into the current scheme used now, but not with the same usages. The chords (triads anyway) were known and used but a good description wasn't available. The musicians (as usual) outran the theorists.

By the 1600s, it was clear the that modes on D and E (as then used) were characterized by the having a minor third (D to F and E to G respectively); the modes on F and G were characterized by having a major third (F-A and G-B) similarly placed. It was recognized that modes on A and C were also becoming common.

Because of the above characterization of the modes, those with a minor third at the beginning (A,D,E) were termed minor and those starting with a major third (A,F,G) were called major.

Composers also found that the distinction between major and minor was greater that that between other possible modes.
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