I write a lot about audio concepts, and about audio fidelity in particular.  This is an index into audio related posts.

Audio Fidelity Series - Articles covering some particular aspect of what makes audio sound good

Digital Audio Series - Similar to my Audio Fidelity Series, these delve more into details of audio in a digital form

Aliasing

Other Audio Topics - Useful things to know that don't fall into the above categories

About fidelity
Why is everything in audio measured in dB?
Quantization, Sample Rate, and Bits Per Sample
A Lesson in Dynamic Range
32-bit Audio Redux
Always Dither Before You Quantize
The difference between measuring DR and THD+N
Louder Sounds Better
Clipping in Popular Music
You can't hear DC