Ohio State University
Huron's Review of C. Krumhansl's Cognitive Foundations
This book review clearly states in the first paragraph what is not included as part of the text. The book centers its content around the "perception of key." The author is known for her "probe-tone" method, which is defined. For a book...
OpenStax
Open Stax: Catherine Schmidt Jones: Pitch Sharp, Flat and Natural Notes
Learn about the meanings and uses of pitch and accidentals. Including sharp, flat, natural and double sharps and flats, this lesson explains why they are necessary.
Other
Musical Pitch
This site offers a very technical explanation of pitch. The author's emphasis is on tuning by intervals, explaining the different spaces of intervals by name. A very complex interactive diagram is included.