About sounds
http://www.explainthatstuff.com/sound.html
https://cobussen.com/teaching/what-is-music/
http://www.cyberphon.ish-lyon.cnrs.fr/Partie1/
http://www.techniquesduson.com/timbre.html
http://www.sonorisation-spectacle.org/caracteristiques-d-un-son.html
http://mbrivet.free.fr/docs/terminaleS_partie1/niveau_intensite_sonore.pdf
http://2012books.lardbucket.org/books/music-theory/s06-02-pulse-tempo-and-meter.html
http://www.differencebetween.net/science/nature/difference-between-noise-and-music/
https://fr.wikipedia.org/wiki/Son_musical
http://www.physique-chimie-lycee.fr/cours-terminale-s-physique/obs01_3-intensite-sonore.html
http://www.web-sciences.com/documents/terminale/tedo02/teco02.php
http://howgee.blogspot.fr/2006/06/les-vieux-nentendent-pas-cette.html
Around the violin
https://www.yogems.com/yopedia/a-complete-guide-to-violin/
http://newt.phys.unsw.edu.au/jw/violintro.html
https://www.reference.com/hobbies-games/violin-produce-sound-26bc214c62434985
https://www.quora.com/How-is-sound-produced-by-a-violin
http://physicscentral.com/explore/action/fiddle.cfm
http://web.mit.edu/2.972/www/reports/violin/violin.html
http://illumin.usc.edu/73/the-violin-the-art-behind-the-sound/
https://fr.wikipedia.org/wiki/Violon
http://hyperphysics.phy-astr.gsu.edu/hbase/Music/violin.html
http://hyperphysics.phy-astr.gsu.edu/hbase/Waves/string.html#c1
https://plus.maths.org/content/why-violin-so-hard-play
http://www.edn.com/electronics-blogs/living-analog/4441106/Acoustic-Efficiency-
https://vsl.co.at/en/Violin/Construction
https://prezi.com/m9_nyyignibu/mathematics-of-the-violin/
http://www.violinist.com/violin/how-to-hold-a-violin/
http://www.differencebetween.net/science/nature/difference-between-noise-and-music/
Frequency and harmonics
http://www.pianoweb.fr/harmoniques-etfrequences.php
http://www.sengpielaudio.com/calculator-harmonics.htm
http://accromath.uqam.ca/2007/02/la-construction-des-gammes-musicales/
http://ressources.univ-lemans.fr/AccesLibre/UM/Pedago/physique/02/meca/violon.html
https://fr.wikipedia.org/wiki/Onde_sur_une_corde_vibrante
http://hyperphysics.phy-astr.gsu.edu/hbase/Waves/string.html
Musical scales
https://www.youtube.com/watch?v=VyIfIft6g3Q
http://d.ruze.free.fr/spphcr2013/tp3/Frequences_gammes.htm
http://www.lorientales.com/?mode=musiques
http://www.tao-yin.com/beaux-arts/notes_musique.html
https://www.easyzic.com/dossiers/la-gamme-temp%C3%A9r%C3%A9e,h153.html
https://tpemusiquemodale-tonale.jimdo.com/syst%C3%A8me-tonal/la-gamme-temp%C3%A9r%C3%A9e/
http://www.cosmovisions.com/musiGamme.htm#m5SW1OOY4u2MSoTj.99
http://snocquet16.wixsite.com/musiquedes5elements/5-elements-et-5-instruments
http://www.les-ziboux.rasama.org/gammes-harmonie-rythmes-musique-arabe.html
http://www.larousse.fr/encyclopedie/musdico/chinoise/166786
http://pedagogie.ac-toulouse.fr/lotec/ecoleetcinema/wp-content/uploads/MUSIQUE-CHINOISE.doc
http://www.universalis.fr/encyclopedie/echelle-pentatonique/
http://www.apprendrelesolfege.com/chiffrage-de-mesure
http://musictheoryblog.blogspot.fr/2007/01/measures-and-bar-lines.html