It's a good place to start. Information Acoustics and the Physics of Sound from About A short directory of links on the phyiscs of sound. The real value here is that this directory is part of a much larger directory of physics with links to areas related to sound such as fluid dynamics, thermodynamics, electromagnetics, mechanics, and others. The Sound Page Not exactly a FAQ, but a good place to learn a lot about sound. This is a private site including a series of tutorial pages covering areas from theory to pracitcal issues on the construction of a quiet sound room.
Site also includes demo sound files, sound system design and construction, and test measurements.
This second edition of Professor Barry Truax's Handbook of Acoustic Ecology , first published in 1977, is a compendium of acoustical related information. The cross-references in the original publication are now implemented in hyperlinks through the browser interface. Also offered are tables of the musical scales including major, minor, melodic minor, penatonic, and others. Abdullah also offers the mathematical relationship needed to compute frequencies from any give starting note. Here's another table that extends Abdullah's range to both higher and lower frequencies.