Pitch and Intervals

You hear a friend sing a familiar tune in a different register. Their starting note is different from the recording, yet you recognize the song almost immediately. What stayed the same?

A melody has relationships between its notes, as well as individual pitches. This lesson separates moving an entire phrase from editing one note inside it. You will not need to identify notes by ear. Use the sound, the diagram, and the printed note names together.

Allow about ten minutes, including repeated listening. First recall lesson 1: the timing of a note and its pitch are separate choices. Here we keep the timing fixed.

Listen to the shape, then inspect the distances

Play Original, then All notes +5. Hum along if comfortable, or simply follow the rise and fall with a hand. Does the second version sound like a different register of the same idea? Now compare One note +1 with the original. Listen around the highest point.

The diagram reads left to right in time; higher marks represent higher pitches. Its vertical scale stays fixed across the three choices. A mark’s width shows the scheduled sound length, not its loudness. The note names provide a text alternative to the picture.

The original begins C–D–E. Those movements are two semitones up and another two semitones up. The shifted version begins F–G–A, with exactly the same distances. The whole phrase moves five semitones higher: this is transposition. The starting pitch changes, but the intervals and rhythm remain intact.

In the one-note edit, G becomes G♯. E to G was three semitones; E to G♯ is four. The return from that note to E also changes. Both melodies still climb and fall in the same general direction. Contour is useful, but it is less specific than an exact interval pattern.

A small vocabulary for pitch

The letter names run A through G and then repeat. A sharp, ♯, raises a written note by a semitone; a flat, ♭, lowers it. The number identifies the octave: C4 is middle C in the convention used here. E–F and B–C are already semitone neighbors; there is no missing black key you must count. Half steps and whole steps

Our sounds use twelve-tone equal temperament: twelve equal semitone steps make an octave, and an octave doubles the frequency. You do not need that calculation to do the exercise. Other musical traditions and tuning systems organize pitch differently; this is a practical starting vocabulary for much Western tonal music.

Transfer the idea to an unfamiliar phrase

Before playing the next model, predict what a correct transposition must preserve. Is keeping the first and last notes enough? Is keeping only the direction of each move enough?

Compare the reference with P, then with Q. Choose an answer first; the revealed diagram then lets you check the pitches and distances. Checking a relationship is the goal; instant recognition is not.

What recognition does—and does not—prove

Try singing the first few notes of a familiar tune from two comfortable starting pitches. Notice which leaps you keep, and where you accidentally flatten a leap to fit your voice. Describe the change as “the whole phrase moved” or “this particular interval changed.”

Next, we learn to write and read these pitch relationships on a five-line staff.