In music a simple interval is an interval of less than an octave, which is distinguished from a compound interval which is an interval greater than one octave. In music theory, an interval is the distance in pitch between two notes, the lower and higher members of the interval. ... In music, an octave (sometimes abbreviated 8ve or 8va) is the interval between one musical note and another with half or double the frequency. ...

The most common simple intervals are unison, minor second, major second, minor third, major third, perfect fourth, tritone, perfect fifth, minor sixth, major sixth minor seventh, major seventh, but also include any interval below an eighth, or the octave. UNISON logo UNISON is the largest trade union in the United Kingdom, with over 1. ... The musical interval of a half step, semitone, or minor second is the relationship between the leading tone and the first note (the root or tonic) in a major scale. ... The musical interval of a major second — also called a whole-tone — is the relationship between the first note (the root or tonic) and the second note in a major scale (and also a minor scale). ... The musical interval of a minor third is the relationship between the first note (the root or tonic) and the third note in a minor scale. ... The musical interval of a Major third is the relationship between the first note (the root or tonic) and the third note in a major scale. ... The musical interval of a perfect fourth, often P4, is the relationship between the first note (the root or tonic) and the fourth note (subdominant) in a major scale. ... The augmented fourth between C and F# forms a tritone. ... The musical interval of a perfect fifth is the relationship between the first note (the root or tonic) and the fifth note in a major scale. ... The musical interval of a minor sixth is the relationship between the first note (the root or tonic) and the sixth note in a minor scale. ... The musical interval of a major sixth is the relationship between the first note (the root or tonic) and the sixth note in a Major scale. ... The musical interval of a minor seventh the first note (the root or tonic) and the seventh in a minor scale. ... The musical interval of a Major seventh the first note (the root or tonic) and the seventh, the leading tone, in a major scale. ...