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5b.  What is this Formula   -  T    2    2    1    2    2    2    1  ?

The formula is relating to Tones and Semitones

Each note side by side is a semitone interval

If you skip one note and go to the next note, this is a Tone

See the diagram below

The notes of the A Major Scale are

A  B  C#  D  E  F#  G#  A

On the guitar each note (fret) side by side of each other is a Semitone interval.

If you miss one note (fret) and go to the next note (fret) this is then a Tone.

NOTE:- All the blue numbers shown on the guitar neck are the notes of the A Major Scale all over the neck of the guitar.  You see there are many positions to play any scale on the guitar.  Study the diagram above.

Tones and Semitones on the guitar

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