The major scale or Ionian scale is one of the most commonly used musical scales, especially in Western music. It is one of the diatonic scales. Like many musical scales it is made up of seven notes: the eighth duplicates the first at double itsfrequency so that it is called a higher octave of the same note (from Latin “octavus”, the eighth).

The simplest major scale to write is C major, the only major scale to not require sharps or flats:

C-D-E-F-G-A-B-C ( C major scale )

The major scale had a central importance in European music, particularly in the common practice period and in popular music, owing to the large number of chords that can be formed from it.^{[citation needed]} In Carnatic music, it is known as Dheerasankarabharanam, and in Hindustani classical music it is known as Bilaval.

https://en.m.wikipedia.org/wiki/Major_scale