An american scientific pitch notation (Aspn) representation of a musical note; this
standard is used to represent notes in a way that is consistent with the
American scientific pitch notation system, which uses a combination of a pitch class
(represented as an integer) and an octave (represented as an Octave) to uniquely
identify a musical note. The pitch class is the note’s position in the chromatic scale,
while the octave indicates the note’s position in the musical range.