A. Major Scale
— The major scale (or Ionian mode) is one of the most commonly used musical scales, especially in Western music. It is one of the diatonic scales. Like many musical scales, it is made up of seven notes: the eighth duplicates the first at double its frequency so that it is called a higher octave of the same note (from Latin "octavus", the eighth).
A. Harmonic Intervals
— Harmony, in music, is the vertical arrangement of simultaneous sound production of notes that blend into a chord. Harmonies with three or more notes are called chords. Notes blend together to create sounds, could be pleasing and smooth-sound (they call it consonance), or harsh sound (dissonance).
A. Whole Step
— A whole step is the distance between two notes that have one note in between them. In other words, a whole step is equal to two half steps or two semitones. If you play the note C on the piano, the note D is one whole step above it, and B flat is one whole step below it.
