Acoustics
Acoustics is the science of (musical) sound and hearing. Often divided in the following subdomains:
- Acoustics of spaces/rooms/halls
- String instruments
- String instruments with keyboard
- Wind instruments
- Percussion instruments
- The voice
- Tuning and temperaments
A fine introduction to this knowledge domain is the book
Fundamentals of Musical Acoustics - Arthur H. Benade.
A good addition to that are the subject articles from Oxford Music Online:
- Acoustics
- Hearing and Psychoacoustics
- Sound
- Tuning
- Temperaments
- Mean tone temperament
- Just intonation
- Pythagorean intonation