I’m not exactly sure what Deltaphone is for, but this afternoon, it was for analyzing the structure of Terra’s Theme from Final Fantasy VI. (Thanks to 8-bit of 8-bit Music Theory, who did all the work.) The melodic line consists of a phrase repeated three times, and this phrase is expressed in the
prefix function below. Did you know the A section and the B section simply swap the roots of these three iterations? The A section’s three iterations start at G#, G#, and B. The B section’s three iterations start at B, B, and G#.
Hit the Play button to hear. The editor is a little cramped in this blog; I suggest you scroll down and click Expand to open it in a new tab or window.