by Jimmy Veith
Have you ever been freaked out by a piece of music that sounded evil? Have you heard combinations of notes that were so dissonant that it made you tense and restless, but yet was strangely alluring? Well, you may have been placed under the spell of the Devil’s interval, known in music theory as the augmented 4th or flatted 5th.
Let me explain. Remember when Maria, the good Nun from “The Sound of Music”, taught the children how to sing, with the Do-re-mi-fa-so-la-ti-do song? That was the major scale on which most Western music is based. In the key of C, it would be all the white keys on the piano; ie, C, D, E, F, G, A B and C. Each note of the scale is assigned a number. In the key of C, C is 1, D is 2, E is 3, F is 4, G is 5, A is 6 and B is 7.
For some mysterious reason, the major scale is not symmetrical in its intervals. There are whole steps between C, D, and E, but a half step from E to F. There are whole steps between F, G, A and B, but a half step from B to C. Now, let’s create a more sinister sounding scale by eliminating the half steps and playing only whole steps. If you start with middle C, you would play C, D, E, F# (G flat), G# (A flat), A# (B flat), then C again. You have just played a scale based on the tri-tones, which is a scale of six different notes in equal intervals as opposed to seven notes found in the major scale.