"10. 1980. Sony makes the first compact disc and takes the cut out perforations pattern from player piano paper music rolls from 100 years earlier and duplicates the pattern to the surface of the compact disc and the perforations from the player piano roll become pits on the disc for the laser to read."
I don't see how this would work. The pattern of perforations on the piano roll only captures performance information, not audio. You need 44,100 16 bit samples per channel for the CD. Paper piano roll data density not even close....
"12. 1980. Pioneer makes the worlds first commercial Laser movie disc and by 1986 produced laser movie disc players for the retail market."
Laserdiscs were an analog technology, both audio and video. As digital technology matured, ways were found to add digital soundtrack information to the laserdisc, but the video remained analog (composite actually).
Agree with Marakanetz about the importance of Fourier Analysis as the underpinnings of all audio. We should also add the Nyquist Sampling Theorem to the list.
