What is the Ionian scale?

The Ionian scale is indeed a major scale. It is one of the seven modes of the diatonic scale and is specifically characterized by its whole and half step pattern, which follows the formula: whole, whole, half, whole, whole, whole, half. This pattern creates a cheerful and bright sound typical of major scales.

The scale starts on the first degree of the major scale, making the Ionian mode synonymous with the major scale itself. For example, if you were to take the notes of the C major scale (C, D, E, F, G, A, B), you are essentially playing the Ionian mode starting on C, reinforcing its identity as a major scale.

In contrast to this, the other scales listed—minor, chromatic, and pentatonic—have different structures and characteristics that do not align with the defining features of the Ionian scale. These structures result in distinct musical qualities that are separate from the bright and harmonious nature of the major scale.