Letter + optional Accidental + Octave
| Part | Values | Example |
|---|
| Letter | A through G (case-insensitive) | C, f |
| Accidental | # or s (sharp), b (flat), or omit (natural) | #, b |
| Octave | integer (-1 to 9) | 4 |
Examples: C4 (middle C), A4 (440 Hz), D#3, Bb2, Fs5, G7
Common Frequencies
| Note | Frequency |
|---|
| C2 | 65 Hz |
| C3 | 131 Hz |
| C4 | 262 Hz (middle C) |
| A4 | 440 Hz (tuning standard) |
| C5 | 523 Hz |
| C6 | 1047 Hz |
Duration Reference (at 120 BPM)
| Duration | Beats | Milliseconds | Musical Name |
|---|
4 | 4 beats | 2000 ms | Whole note |
2 | 2 beats | 1000 ms | Half note |
1 | 1 beat | 500 ms | Quarter note |
0.5 | 1/2 beat | 250 ms | Eighth note |
0.25 | 1/4 beat | 125 ms | Sixteenth note |