If you take an instrument without predefined notes, such as a trombone or a violin, you can produce an infinite amount of notes between Do and Re for example (applies with out of tunes instruments as well). With that logic, you could have an infinite set of 7 notes that are as evenly « spaced » as our current standard. Im sure im missing something obvious.
In: Physics
The way the average person with no musical training would sing them is called a major scale. The reason it’s such a standard is because 1. It sounds really pleasing to the brain, and 2. It starts and ends on the same “note.”
You could certainly hit 8 microtones between an A and a C, but they wouldn’t end back on an A. The major scale is a very musically satisfying and self-resolving way to get from a certain note back to itself, either one octave higher or lower.
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