A major scale is a Scale which starts on a chosen note and progresses by a pattern of Intervals which is:
|Whole Tone - Whole Tone - Semitone - Whole Tone - Whole Tone - Whole Tone - Semitone |
That is, for example the scale of C major:
| Scale of C Major|| C||- ||D||-||E||F||-||G ||-||A||- ||B ||C' |
| All Notes in the Octave|| C||C#||D||Eb ||E ||F ||F# ||G ||G# ||A ||Bb ||B ||C' |
| Intervals of the Major Scale|| - 2 -|| - 2 -||1 - || - 2 -|| - 2 - ||- 2 - ||1- || |
| || - W-|| - W -|| S -|| - W -|| - W -|
- W -
|S - || |
The interval is the 'gap' between two notes, so between C and D is a whole Tone, between D and E is a whole Tone, between E and F is only a Semitone etc.
On a Fretted stringed Instrument, this is equivalent to 2 frets, 2 frets, 1 fret etc.
The modern major scale is based on the Ionian Mode.