By default, use any chromatics that are included in said scale that you are using (such as blues, bebop scale, etc.)
However, in the case that you are using any regular major, natural minor, or modal scale – here are some times and where and how to throw in chromatics:
Typically, chromatics between the notes of the scale are used as neighboring tones, passing tones, or enclosures.
That being said, in any job their focus in to bring emphasis the arrival note.
So, as you are using a chromatic line, or just inserting chromatic pitches into a scale, think about the following:
- Are they going in the direction of the note that needs the most attention?
- Is it used for enclosing/neighboring effect?
- Does the chromatics sound sublime or out-of-nature to the key?
From this assessment, you can add the right chromatic notes to the line.
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