A major scale is a set of notes. 
A major scale is a set of notes. 

A major scale is a set of musical notes. 

One famous scale is C major. It is easy to write. You play it using only the white keys on a piano. Other scales use sharps or flats. These are notes that fall between the main keys.
Scales follow a special pattern of steps. These are whole steps and half steps. A major scale uses a specific order of these steps. You can think of it as two identical parts. Each part has two whole steps and one half step.
Different cultures use these sounds too. In Carnatic music, it is called Sankarabharanam. In Hindustani music, it is called Bilaval. There are also other types of scales. These include the Lydian and Mixolydian modes. Musicians use these different patterns to make many kinds of songs.
A major scale is a special set of musical notes. 

To make a major scale, you follow a specific pattern of steps. These steps are called whole tones and semitones. A semitone is a half step. A whole tone is a whole step. The pattern goes: whole, whole, half, whole, whole, whole, half. You can also see this as two identical parts called tetrachords. Each tetrachord has two whole steps and one half step. This pattern makes the scale sound balanced and even.
Many different cultures have their own names for these sounds. In Carnatic music, this scale is known as Sankarabharanam. In Hindustani classical music, it is called Bilaval. The C major scale is the simplest one to write. It is the only major scale that does not need sharps or flats. On a piano, you can play it using only the white keys. Other scales, like E major, use three flats to work. 
Musicians use special names for each note in the scale. The first note is called the tonic. The second is the supertonic, and the third is the mediant. The fourth is the subdominant, and the fifth is the dominant. The sixth is the submediant, and the seventh is the leading tone. These notes help build chords. For example, the first note forms a major triad. The second note forms a minor triad. These patterns create the harmony we hear in songs.
Scales are part of a much larger musical world. You might hear other types like the Lydian or Mixolydian modes. There are also harmonic and melodic major scales. Some musicians even use the pentatonic scale in a major way. You can find all these scales on a circle of fifths. This circle shows how different keys relate to each other. It helps musicians understand which notes belong in a piece of music. 
A major scale is a specific sequence of musical notes. It contains a major triad on its first note, known as the tonic. 
To build a major scale, you must follow a strict pattern of intervals. These intervals are called whole tones and semitones. A semitone is a half step. A whole tone is a whole step. 
Musicians use specific names for the seven notes in the scale. The first note is the tonic. The second note is the supertonic. The third is the mediant. The fourth is the subdominant. The fifth is the dominant. The sixth is the submediant. The seventh is the leading tone. The eighth note is a repeat of the tonic. This eighth note is called an octave. The word comes from the Latin "octavus," meaning eighth. The frequency of this note is exactly double the first note.
These notes create different types of harmony. You can build triads, which are three-note chords, on each scale degree. The first, fourth, and fifth degrees create major triads. The second, third, and sixth degrees create minor triads. The seventh degree creates a diminished triad. 
Scale construction involves mathematical ratios. In equal temperament, a whole tone has twice the frequency ratio of a semitone. An octave consists of twelve equal semitones. The frequency doubles as you move from one octave to the next. Certain intervals have specific ratios. For example, a perfect fifth has a ratio of 3/2, or 1.5. A major third has a ratio of 5/4, or 1.25. These mathematical relationships define the sound of the scale.
Different keys use different notes. The C major scale is the simplest to write. It is the only major scale without sharps or flats. On a piano, it uses only the white keys. 
There are many variations of the major scale. The Lydian and Mixolydian modes are also major diatonic modes. Some scales are more complex. The harmonic major scale includes a minor sixth. The melodic major scale changes depending on if the notes go up or down. The double harmonic major scale has a minor second and a minor sixth. Even gapped scales, like the pentatonic scale, can appear in a major style. All these variations allow musicians to create endless musical colors.
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