Short Answer
Overview
A whole step, frequently termed a whole tone, is an interval spanning two semitone steps on the chromatic scale. In equal‑tempered Western tuning, this distance corresponds to a frequency ratio of approximately 1.12246, or 200 cents. The interval can be heard between notes such as C and D, G and A, or F♯ and G♯, and it is the foundation of the whole‑tone scale, certain chord structures, and many melodic movements.
History / Origin
The concept of the whole step dates back to medieval modal theory, where the term “tone” described the distance between successive notes of a mode. The Italian word “tono” and the French “tone” both entered English musical terminology during the Renaissance. In the 19th century, composers such as Claude Debussy and Alexander Scriabin popularised the whole‑tone scale, cementing the modern usage of “whole step” as a precise interval of two semitones.
How It’s Used
Whole steps appear in a variety of contexts. They are the building blocks of major scales (which follow a whole‑step, whole‑step, half‑step pattern) and many minor scales. In chord construction, a major triad contains a whole step between its root and third, and a perfect fifth contains two whole steps plus a half step. Notation-wise, a whole step is notated by a simple interval name (e.g., M2 for major second) rather than a specific accidental.
Why It Matters
Understanding whole steps is essential for sight‑reading, improvisation, and composition. The interval shapes melodic contour, influences harmonic tension, and underpins tonal relationships. Notable examples include the opening whole‑step motif of Beethoven’s “Symphony No. 5” (the famous “short‑short‑short‑long” rhythm) and the whole‑tone passages in Debussy’s “Voiles” that create an ethereal, ambiguous sound.
Common Misconceptions
A whole step is the same as a major second.
In most modern theory they coincide, but historically “major second” refers to the interval’s quality, while “whole step” describes its size; a major second can be altered (e.g., raised) and no longer be a whole step.
Whole steps only occur in the whole‑tone scale.
Whole steps are present in many diatonic scales, chords, and melodic lines; the whole‑tone scale is just one specific collection built entirely of whole steps.
A whole step equals two piano keys.
On the piano, a whole step spans two keys only when both are white keys (e.g., C to D). Between a white and black key (e.g., E to F♯) the visual distance may be three keys, but the interval remains two semitones.
FAQ
How many whole steps are in a major scale?
A major scale contains two whole steps, followed by a half step, then three whole steps, and a final half step (W‑W‑H‑W‑W‑W‑H).
Can a whole step be altered?
Yes. Adding a sharp or flat to either note changes the interval's size, making it a diminished or augmented second rather than a pure whole step.
Is a whole step the same in just intonation?
In just intonation, whole steps can have slightly different frequency ratios (e.g., 9:8 or 10:9) depending on the tuning system, unlike the fixed 2:1^(2/12) ratio of equal temperament.
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