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Music Theory Lessons
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[TOC]

Lesson #1 - Intervals
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> **Definition:** The distance between two notes.

| Semitones |  Min/Maj/Per   | Short |      Aug/Dim      | Short  |          Alternative           | Short |
|:---------:|:--------------:|:-----:|:-----------------:|:------:|:------------------------------:|:-----:|
|     0     | Perfect unison |  P1   |                   |   d2   |                                |       |
|     1     |                |  m2   | Augmented unison  |   A1   | Semitone, Half tone, Half step | S, H  |
|     2     |                |  M2   |                   |   d3   |  Tone, Whole tone, Whole step  | T, W  |
|     3     |                |  m3   |                   |   A2   |                                |       |
|     4     |                |  M3   |                   |   d4   |                                |       |
|           |                |       |                   |        |                                |       |
|     5     | Perfect fourth |  P4   |                   |   A3   |                                |       |
|     6     |                |       |                   | d5, A4 |            Tritone             |  TT   |
|     7     | Perfect fifth  |  P5   |                   |   d6   |                                |       |
|           |                |       |                   |        |                                |       |
|     8     |                |  m6   |                   |   A5   |                                |       |
|     9     |                |  M6   |                   |   d7   |                                |       |
|    10     |                |  m7   |                   |   A6   |                                |       |
|    11     |                |  M7   | Diminished octave |   d8   |                                |       |
|    12     | Perfect octave |  P8   |                   |   A7   |                                |       |


0	Perfect unison	P1	Diminished second
1	Minor second	m2	Augmented unison
2	Major second	M2	Diminished third
3	Minor third	m3	Augmented second
4	Major third	M3	Diminished fourth
5	Perfect fourth	P4	Augmented third
6	
7	Perfect fifth	P5	Diminished sixth
8	Minor sixth	m6	Augmented fifth
9	Major sixth	M6	Diminished seventh
10	Minor seventh	m7	Augmented sixth
11	Major seventh	M7	Diminished octave
12	Perfect octave	P8	Augmented seventh

![basic chords for ash](https://hackmd.io/_uploads/rJ2YfsV0A.png)



Lesson #2 - Scales
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> **Definition:** Set of notes

a.

Lesson #3 - Keys (Key Signitures)
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> **Definition:** Set of notes that are related to each other by their intervals and have a tonic note.

a.

Lesson #4 - Chords
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> **Definition:** Two or more notes played simultaniously.

a.