A Pitch is a frequency for a note to be played at.
Parameters
accidental
an adjustment to the base frequency
name
the name of the corresponding note, which provides the base frequency; one of "cdefgah" or their upper-case equivalents
octave
the number of the octave relative to DefaultOctave; e.g., -2 means two octaves lower than the default; passing in None has the same effect as passing in zero
