What is an interval on a scale?

Answer 1

An interval is the distance between 2 notes or pitches. There can be perfect, major, minor, diminished or augmented intervals. A perfect interval includes a unison, 4th, 5th and octave (P1, P4, P5, P8). A major interval (M2, M3, M6, M7) means that the top note is included in that bottom note's major scale (C to A is a Major 6th). A minor interval (m2, m3, m6, m7) means that the top note is included in the bottom note's minor scale (C to Eflat is a minor third). Diminished and augmented intervals are going to appear with perfect 4ths and 5th most often (C to Gflat is a d5, C to Fsharp is an A4). These last two are also known as tritones.