Hobbies Playing Music Table of Intervals in Music Theory Easily Identify Perfect, Major and Minor Intervals Share PINTEREST Email Print Tetra Images/Hill Street Studios/brand X Pictures/Getty Images Playing Music Music Education Basics Music History Music Lessons Music Theory Playing Guitar Playing Piano Home Recording By Espie Estrella Espie Estrella is a lyricist, songwriter, and member of the Nashville Songwriters Association International. our editorial process Espie Estrella Updated November 04, 2019 In music theory, an interval is the measure of the distance between two pitches. The smallest interval in Western music is a half step. There are several types of intervals, like perfect and non-perfect. Non-perfect intervals can be either major or minor. Perfect Intervals Perfect intervals have only one basic form. The first (also called prime or unison), fourth, fifth and eighth (or octave) are all perfect intervals. These intervals are called "perfect" most likely due to the way that these types of intervals sound and that their frequency ratios are simple whole numbers. Perfect intervals sound "perfectly consonant." Which means, when played together, there is a sweet tone to the interval. It sounds perfect or resolved. Whereas, a dissonant sound feels tense and in need of resolution. Non-Perfect Intervals Non-perfect intervals have two basic forms. The second, third, sixth and seventh are non-perfect intervals; it can either be a major or minor interval. Major intervals are from the major scale. Minor intervals are exactly a half-step lower than major intervals. Table of Intervals Here is a handy table that will make it easier for you to determine intervals by counting the distance of one note to another note in half steps. You need to count every line and space starting from the bottom note going to the top note. Remember to count the bottom note as your first note. Perfect Intervals Type of Interval Number of Half-steps Unison not applicable Perfect 4th 5 Perfect 5th 7 Perfect Octave 12 Major Intervals Type of Interval Number of Half-steps Major 2nd 2 Major 3rd 4 Major 6th 9 Major 7th 11 Minor Intervals Type of Interval Number of Half-steps Minor 2nd 1 Minor 3rd 3 Minor 6th 8 Minor 7th 10 Example of Size or Distance of Intervals To understand the concept of size or distance of an interval, look at the C Major Scale. Prime/First—C to C Second—C to D Third—C to E Fourth—C to F Fifth—C to G Sixth—C to S Seventh—C to B Octave—C to C Quality of Intervals Interval qualities can be described as major, minor, harmonic, melodic, perfect, augmented, and diminished. When you lower a perfect interval by a half step it becomes diminished. When you raise it a half step it becomes augmented. When you lower a major non-perfect interval a half step it becomes a minor interval. When you raise it a half step it becomes augmented. When you lower a minor interval by a half step it becomes diminished. When you raise a minor interval a half step it becomes a major interval. Inventor of the Interval System Greek philosopher and mathematician, Pythagoras was interested in understanding the notes and scales used in Greek music. He is generally considered the first person to call the relationship between two notes an interval. In particular, he studied the Greek stringed instrument, the lyre. He studied two strings with the same length, tension, and thickness. He noticed that the strings sound the same when you pluck them. They are in unison. They have the same pitch and sound good (or consonant) when played together. Then he studied strings that had different lengths. He kept the string tension and thickness the same. Played together, those strings had different pitches and generally sounded bad (or dissonant). Finally, he noticed that for certain lengths, the two strings may have had different pitches, but now sounded consonant rather than dissonant. Pythagoras was the first person to designate intervals as perfect versus non-perfect. What are Intervals? Definition and Examples of Melodic Intervals Understanding Dissonant and Consonant Chords Overview of Pentatonic Scales in Music Theory A Musical Chord Defined Learn to Play Diminished Chords on Bass Illustrated Piano Chord Library Suspended Chords How a Diminished Chord Is Created What Are Diminished and Augmented Triads? Printable Piano Lesson Book Five Positions of the Pentatonic Scale for Guitar triad Minor Scales: Natural, Harmonic, and Melodic The Italian Commands of Piano Music What Are Harmonic Intervals in Music Theory?