# Music = Math + History

To really appreciate music, you must understand this Math & history :
5 notes to 7 notes to 12 notes.
& fractions: 3/2, 3/4, 2/1 (octave)

Music = Math + History

1. Ancient China 600 BC 管仲 (5 notes 宫商角徵\zhǐ羽）

2. Pythagoras 450 BC (7 notes, Chords 和弦)

3. Modern Music: 十二平均律 (明朝 1600 AD 朱载堉- > Bach 1700 AD)

https://m.toutiaoimg.com/group/6683391962764018183/?app=news_article_lite&timestamp=1581773659&req_id=20200215213418010194100050312DF0B9&group_id=6683391962764018183

Pythagoras did not believe in Irrational numbers (sqroot 2) , so only 7 integer notes.

17CE Chinese 明朝 Prince invented 12 notes music, using a giant 81-row Abacus to compute the12th root of 2 (picture below) ：

https://chinoiseries2014.wordpress.com/2019/02/07/%e5%8d%81%e4%ba%8c%e5%b9%b3%e5%9d%87%e7%8e%87/

# Category Theory in Music

Lesson 1.1 : Overview

Lesson 1.2 : Maps

Lesson 1.3 [Video] : Commute, Identity Morphism

Lesson 1.4 [Video] : Identity Law (Set Endomorphism), Associativity Law

Lesson 1.5 : [Video] Category of Sets (Concrete Category)
$f : A \rightarrow B$
$f^{op} : B \rightarrow A$

Number of Set Mappings: $\displaystyle \boxed { |f |= |B|^{|A}= |f^{op}|}$

Universal Mappings Properties (UMP)

Initial Object: $0 \rightarrow X$

Terminal Object: $X\rightarrow 1$

# Music and math: The genius of Beethoven

Music and math: The genius of Beethoven – Natalya St. Clair:

Music = Math

# Music and Mathematics are Apolitical

This “Butterfly Lovers Violin Concerto” (梁山伯与祝英台: 梁祝 小提琴协奏曲 ) composed 50 years ago by 2 Chinese music students, now played so lovely by a Japanese lady violinist: 诹访内晶子 (Akiko Suwanai), who is the current user of the violin ”Dolphin”, one of the top 3 violins in the world made by Antonio Stradivarius

Only in the kingdom of Music (the other one is Mathematics) where human political hatred does not exist between countries due to past wars: Japan and China, Germany and the Allied Nations, … Just only yesterday China President Xi and Japan PM Abe both showed awkward “poker face” hand-shake at the APEC Beijing meeting; contrast to the 20th century’s greatest mathematician David Hilbert from Nazi Germany was welcome  in America to chair  the inauguration of the International Congress of Mathematics.

If more students love Math and Music, the world of tomorrow will be more peaceful.

Watch 諏訪內晶子 -《梁祝小提琴協奏曲》   Butterfly Lovers Violin Concerto. Notice her 1714 ‘magical’ violin is the treasure gift “Dolphin Stradivarius”, once owned and played by the virtuoso Jascha Heifetz (1901–1987).

Notes:
The legendary love story is the Chinese version of “Romeo & Juliet“:

http://en.m.wikipedia.org/wiki/Butterfly_Lovers’_Violin_Concerto

Interview with Akiko Suwanai

The history of the 2 composers (1958)

# Math and Music

If you want your kids to grow up with Math talent, start young in Music, be it playing a simple drum or flute, later then at age 4 or 5 progressing to piano or violin, along the way pick up musical theory…

Notice that great mathematicians (or Physicists the close cousins of Math) are often music talented, but the converse not true! Einstein performed violin with an orchestra formed by a group of Nobel Prize Physicists; never heard Mozart or Langlang (朗朗) or any great musicians proved any Math Conjectures.

Music trains the abstract thinking mind, good for mastering the most abstract subjects like Abstract Algebra or ‘Abstract’ Physics (Quantum Physics).

http://www.thecrimson.com/article/1988/11/30/music-math-a-common-equation/?page=1

# Math is like Music

Prof Alice Chang Sun-Yung (University of Princeton, Geometric Analysis)

“Math is a language like music. To learn it systematically, it is necessary to master small pieces & gradually add another piece & then another… In a sense, Math is like the classical Chinese language – very polished, very elegant. Sitting in a good math lecture is like sitting in a good opera. Everything comes together.”