- Use the number
to represent C.**0** - Use the number
to represent C-sharp or D-flat.**1** - Use the number
to represent D.**2** - Use the number
to represent D-sharp or E-flat.**3** - ...
- Use the number
to represent A.**9** - Use the letter `
' to represent A-sharp or B-flat.**A** - Use the letter `
' to represent B-natural or C-flat.**B** - Notes need not be separated by spaces.

Pitch-class represents pitch without regard to
*spelling* -- a C-sharp and D-flat are equivalent.
When searching by pitch-class:

0 7 00 B 0 A 0B0A |