Scientific pitch notation numbers change between B and C, not across octaves symmetrically.

Evidence

In this book the system which uses A4 to represent the A above middle C has been adopted. The number changes between the notes B and C, and capital letters are always used for the names of the notes. Thus middle C is C4, the B immediately below it is B3, etc. The bottom note on an 88-note piano keyboard is therefore A0 since it is the fourth A below middle C, and the top note on an 88-note piano keyboard is C8. — David Howard, Jamie Angus, coustics and Psychoacoustics, 772

Categorization

• DEFINE: Clarifies the A4/C4 scientific pitch notation system used throughout the book and in audio engineering.