The chord of the seventh system brings on jitters. And Instability can use the scales of the gourd on the seventh system chord. I summarize the scale that I am the most popular, and is practical and introduce it.
The scale which resists a sound of diminish chord in the semitone of the seventh chord to fall under to the full. For example, I flip constitution sound of G#dim on the chord of the G7. In the first place G#dim is completed only by a semitone giving 1st by constitution sound of the G7. In the relations, it is said that it is desirable to sound G#dim on the G7.
The music example which I used diminishscale for
Altered 7th scale
This scale has Altered tension note(b9,#9,#11,b13).
The music example which I used a Altered 7th scale for
In A7 which did the second measure 3 beats - 4 beats two five modulations, I use the A Altered 7th scale. The music is rhythm of the splashes of 16 minutes.