Change chromatic_pitch_number to diatonic pitch-class name / alphabetic accidental abbreviation / octave number triple:
abjad> pitchtools.chromatic_pitch_number_to_diatonic_pitch_class_name_alphabetic_accidental_abbreviation_octave_number_triple(13, accidental_spelling = 'sharps')
('c', 's', 5)
Return tuple.
Changed in version 2.0: renamed pitchtools.number_to_letter_accidental_octave() to pitchtools.chromatic_pitch_number_to_diatonic_pitch_class_name_alphabetic_accidental_abbreviation_octave_number_triple().