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Does a diatonic scale contain more than 7 pitches?

Music: Practice & Theory Asked by wcobalt on October 25, 2021

Let’s assume we have an A-minor which begins at A1 (I mean 1st octave). According to the interval pattern of minor scale pitches which are in the scale are: A1, B1, C1, D1, E1, F1, G1. Okay, but can I continue the pattern and use A2, B2, C2, etc as pitches of A1-minor?

4 Answers

A scale is defined by two tetrachords or with other words: by the tones between one octave, whereby the octave of the root (8 => 1) is identified as the same pitch class, and the scale remains the same 9 = 2, 10 = 3 etc.

Answered by Albrecht Hügli on October 25, 2021

Your example is in fact A natural minor. There are other minor scales with slightly different notes - but still called 'A minor'.

It matters not which notes you play - they are all actually the white keys on a piano - any (all) of them belong to A minor. You may have trouble singing a song with A4, B7 and C3 - those are big jumps in pitch!

If you start at the lowest white key and play every white key in turn, you have played a seven-and-a-bit octave A natural minor scale, ascending. Most people would play a two or three octave scale, starting somewhere near the middle , say A3 or A4.

Answered by Tim on October 25, 2021

You're talking about the difference between pitch and pitch class.

Pitch class is a pitch and all its octaves, like C1, C2, C3...

A diatonic scale contains 7 pitch classes. Usually people skip the term classes, because it's understood in context. Theoretically a scale has infinite pitches.

Answered by Michael Curtis on October 25, 2021

A scale can be continued in both directions as far as you want.

Answered by PiedPiper on October 25, 2021

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