Under the outdated material concepts of reality, everything under the sun has been classified, cataloged and described under approximations of the Newtonian commercial science material world order.
Since there is no point in reinventing the wheel, I present the Creative commons license to post physics content from Khan Academy on the free access portion of Omega432.com
I find the content from Khan Academy credible for student study into the basics and classical physics point of view on the mechanical nature of sound.
Access to new innovations on the nature of sound can be found in the private membership area of the website.