I believe the answer is Rubato, when composers slightly slow down or speed up the tempo of the music
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Many scales are diatonic including Major, Minor (the Harmonic minor is an exception) and modal scales. Examples of non-diatonic scale are pentatonic, octatonic and whole-tone scales.
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So basically what is happening is the fact that a person is sick and it is basically written as wording in a sense to signify that.Sorry, I had to rush.Hope this helps!
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