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Consonant and Dissonant
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In the Hevner's summary in the book "Handbook of Music and Emotion: Theory, Research, Applications", there is a row called "Harmony". This attribute has 2 values. They are "simple" and "complex".

I regard "simple" as "Consonant" while "complex" as "Disconnant". I have included the reason in this page.


Video
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The following videos explain what consonant and dissonant are. For persons like me that have not received formal music theory training, they can still hear the difference between two.

**Consonant vs Dissonant Intervals - ear training**

.. raw:: html

	<iframe width="560" height="315" src="https://www.youtube.com/embed/fabeLu4-Ja0" frameborder="0" allowfullscreen></iframe>

| Consonant sounds smooth.
| Consonant intervals: Third, Forth, Fifth and Octave
| Dissonant Intervals: second, Augmented fourth or diminished fifth, seventh 

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**Consonant and Dissonant Music** 

.. raw:: html

	<iframe width="560" height="315" src="https://www.youtube.com/embed/b1Ph0sa0Gc0" frameborder="0" allowfullscreen></iframe>
	
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**Music 133 - Consonance and Dissonance 1** 

.. raw:: html

	<iframe width="560" height="315" src="https://www.youtube.com/embed/ihxASKVkkwg" frameborder="0" allowfullscreen></iframe>

Consonant intervals (Higher the order is, the greater rhe consonant is):  Unison, Octave, perfect fifth (i.e. 7 semitones), perfect forth (It is the inversion of perfect fifth), major third, major sixth, minor third, minor sixth


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Text
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Basic
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- 5.3. Consonance and Dissonance
	| http://www.earmaster.com/music-theory-online/ch05/chapter-5-3.html
	| It lists out the Consonant Intervals and Dissonant Intervals (i.e. Figure 5.26 and Figure 5.27).

- Consonance and Dissonance
	| http://www.oscarvandillen.com/outline_of_basic_music_theory/consonance_and_dissonance/
	| It gives a continue list from most consonant to most dissonant.

- Consonance and Dissonance
	| http://www2.siba.fi/muste1/index.php?id=65&la=en
	| It gives a bried introduction of Consonance and Dissonance.


Advance
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- Consonance and Dissonance
	| http://hyperphysics.phy-astr.gsu.edu/hbase/music/mussca.html
	| It introduces Consonance and Dissonance in physics perspective.

- I read in a music theory book about which intervals are consonant/dissonant in atonal music. Can anyone help? 
	| https://hk.answers.yahoo.com/question/index?qid=20100827132251AADQEQT
	| It introduces a scale called "Paul Hindemith". He ordered intervals from most consonant (unison) to most dissonant (tritone). 

- Why dissonant music strikes the wrong chord in the brain
	| http://www.nature.com/news/why-dissonant-music-strikes-the-wrong-chord-in-the-brain-1.11791
	| It explains why dissonant music is unpleasant.

- Schenker's Theory of Counterpoint (cont.)
	| http://www.schenkerguide.com/consonanceanddissonance.html
	| It explains Consonance and Dissonance by Schenker's Theory.
	
Additional 
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- p.384 of Handbook of Music and Emotion: Theory, Research, Applications
	| https://books.google.com.hk/books?id=ZtwUDAAAQBAJ&pg=PA384&lpg=PA384&dq=harmony+simple+complex+Consonant+Dissonant&source=bl&ots=8DbXH-E-XM&sig=lrZBCkL2Ah1c2N4_Ghz56czSI7M&hl=zh-TW&sa=X&ved=0ahUKEwioh5Sv76_OAhUDFJQKHQ0KD74Q6AEIVzAI#v=onepage&q=harmony%20simple%20complex%20Consonant%20Dissonant&f=false
	| It said Simple refers to Consonant while Complex refers to Dissonant.

- What's the difference between harmony and polyphony?
	| http://music.stackexchange.com/questions/22273/whats-the-difference-between-harmony-and-polyphony
	| It said that harmony can also refer to the "horizontal" relationships between successive vertical relationships of pitches.