10 – Guitar tuning - https://newt.phys.unsw.edu.au/music/guitar/guitarintro.html
9 – First rap song - https://en.wikipedia.org/wiki/Rapper%27s_Delight , https://en.wikipedia.org/wiki/King_Tim_III_(Personality_Jock)
8 – Trumpets - https://en.wikipedia.org/wiki/Trumpet
7 – First recorded song - http://www.greenwych.ca/evidence.htm
6 – Rave music origin - https://en.wikipedia.org/wiki/Rave#Origin_of_.27rave.27_.281950s.E2.80.931970s.29
5 – Fortissimo - https://en.wikipedia.org/wiki/Dynamics_(music)
4 – Difference between high and low - http://www.dspguide.com/ch22/1.htm
3 – Instrument sections - https://en.wikipedia.org/wiki/Orchestra
2 – Out of new music - http://www.easyeartraining.com/faqs/how-many-octaves-are-there-from-20hz-20khz/ , https://en.wikipedia.org/wiki/Octave , http://stattrek.com/online-calculator/combinations-permutations.aspx
1 – First instruments - http://bestbinauralbeats.org/how-music-affects-our-mood/