Other sites that you can visit in order to find relevant information includes:
http://www.physics.swri.edu/SoundView/
This site is the actual program I used in order to record my sounds. It will display many types of graphs of the sounds that you record. It is actually a really cool program if you wish to download it.
http://www.sfu.ca/sonic-studio/Resonance.html
This site focuses a lot on resonance and what it is and what it does. It has audio examples of resonance. Also a part of this site is http://www.sfu.ca/sonic-studio/Soundboard.html. This focuses more on the soundboard and what it does and what it is. You can search for other types of musical terms at http://www.sfu.ca/sonic-studio/index.html. This is the homepage of the two sites. It is the “Handbook for Acoustic Ecology”. Or, in other words, this is a good site that will define just about any kind of musical aspect.
http://www.speech.kth.se/music/5_lectures/wogram/index.html#top
This site gives record of five lectures on the acoustics of the piano. It gives diagrams that show how the soundboard resonates. It also analyzes the different modes of a piano soundboard. http://www.speech.kth.se/music/5_lectures/wogram/modal.html#resonances. That is the site where you can find the actual diagrams.
http://www.geocities.com/johnsankey.geo/build.html
This site is kind of irrelevant, but I thought it was really cool. You can actually go to this site to learn how to build a harpsichord. In a way it is relevant in that a harpsichord you have to know the resonance of the strings and how they pertain to a soundboard in order to build one.
http://olbers.kent.edu/alcomed/Remote/Resonance/resonance.html
This site is mainly a site of reference for resonance. It talks about the different kinds of vibrations and gives the example of the tuning fork and how it vibrates to give off a pure tone. It will then connect you to other sites dealing with waves and amplitudes.