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Table 3 – Frequencies in hertz (Hz) and frequency levels in semitones counted (sc) up from C0 for the usual equal-tempered scale. Subscripts by octaves above C0. C0 approximately equals 16.352 Hz so that A4 = 440 Hz exactly

Table 2 — Interval comparisons in different mathematical tuning systems

Musical Instrument Digital Interface

12.31 MIDI; Musical Instrument Digital Interface. A widely accepted communications protocol enabling music synthesizers, computers, and related equipment to communicate, control, and synchronize with each...

MIDI

12.31 MIDI; Musical Instrument Digital Interface. A widely accepted communications protocol enabling music synthesizers, computers, and related equipment to communicate, control, and synchronize with each...

standard musical pitch

12.30 standard tuning frequency; standard musical pitch. Frequency for the note A4, 440 Hz. Annotation See Table...

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