Understand 12 Musical Notes To Build Your Musical Universe

There are only 12 musical notes before the 13th note repeats the 1st note at one octave higher.
Each of these 12 musical notes is 0.5tone (half tone or semitone) above or below another.

It is important to learn the names and order of these 12 musical notes.

7 of the musical notes are from the first seven English alphabets i.e. A, B, C, D, E, F and G, from lower to higher sound.

Now that we know the 7 names of musical sounds, there are only 5 remaining names.

These 5 remaining notes also takes its name from the 7 alphabets but with an accidental (# aka 'sharp'; b aka 'flat') attached to it.

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When musical notes ascending higher, note takes it name from preceeding letter with # (sharp) added: (A' is one octave higher)

A, A#, B, C, C#, D, D#, E, F, F#, G, G#, A'

When descending musical notes, note takes its name from preceeding letter with b (flat) added:- (G" is one octave lower)

G, Gb, F, E, Eb, D, Db, C, B, Bb, A, Ab, G" (MEMORIZE ORDER AND LEARN TO COUNT)

Note:
1) Between B to C; E to F - there are no accidentals. (Mnemonic Big/Cat; and Eat/Fish)

2) A# same as Bb || C# = Db || D# = Eb || F# = Gb || and finally G# = Ab.

3) Each of these 12 musical notes is 0.5tone (half tone or semitone) above or below another. For example B to D is 1 1/2 tones apart. [B-C (1/2); C-C# (1/2) and C#-D (1/2)].

4) In music, these 12 musical notes, each a semitone above or below the other, are also known as a Chromatic Scale

5) Finally the guitar is a fretted instrument with each fret a semitone above or below the other.

Now understanding and playing chords (triads), scales and music will open up from here.