# Learn music theory in half an hour

Date: 2021-07-21 14:29:42 +08:00Date modified: 2021-11-07 18:34:30 +08:00

- sounds are vibrations of air just repeated quickly in a short period of time

- for the sake of easily referring to the sounds, we name them; the commonly agreed number of notes are 12 composing of an octave;

- scales are the flavor of the song; certain genres are often written in some scales (e.g., blues are often written in Emaj)

- major scales; WWhWWWh

- minor scales; WWWhWWh

# Exercises

- practice applying the major scale for 5

  - D E Fb G A B C# D

  - E# G A A# C D E E#

  - A# C D D# F G A A#

  - G A B C D E F# G

  - C D E F G A B C

  - A B C# D E F# G# A

- practice getting familiar with their letter names

  - assuming A# is the root of the major scale

    - A# is the first

    - C is the second of A#maj

    - D# is the fourth of A#maj

    - D is the third

    - G is the sixth of A#maj

- practice making triads from first through sixth degrees of a major scale

  - G major scale:

    - G B D = Gmaj

    - A C E = Amin

    - B D F# = Bmin

    - C E G = Cmaj

    - D F# A = Dmaj

    - E G B = Emin

    - F# A C = F#dim

  - A major scale:

    - A C# E = Amaj

    - B D F# = Bmin

    - C# E G# = C#min

    - D F# A = Dmaj

    - E G# B = Emaj

    - F# A C# = F#min

    - G# B D = G#dim

  - C major scale:

    - C E G = Cmaj

    - D F A = Dmin

    - E G B = Emin

    - F A C = Fmaj

    - G B D = Gmaj

    - A C E = Amin

    - B D F = Bdim

- each of them has a certain pattern: maj, min, min, maj, maj, min, dim

- practice making chord progressions with numbers

  - 1 4 2 5 in G and A key

  - 4 2 1 1 6 in E

  - 3 1 4 in C