Altered Scale

Played over a V7 chord, the altered scale supplies every altered extension at once: ♭9, ♯9, ♯11, ♭13. It still contains the chord's defining 3 and ♭7, so the dominant function survives intact while the colour goes maximally chromatic. Resolve the line down a fifth to the I and the tension explodes into consonance.

Think of it as the seventh mode of melodic minor — the melodic minor a half step above the dominant's root. For G7alt → Cmaj7: play A♭ melodic minor starting on G. Same seven notes; the new starting point makes every melodic minor scale into a usable V7alt scale.

Now 2 octaves, both hands — the same pattern extended up and back with fingering marked above every note in each hand.