Note pitches are represented as in the MIDI specification, using integers from 0 (lowest pitch) to 127 (highest pitch). That’s a total of 128 pitches (i.e., 10 octaves).

The music library defines the following pitch constants for convenience.

First, there is a special pitch corresponding to rests:

REST

Rests are notes that last as long as you specify (see duration constants), but produce no sound.

Normal pitches are defined as follows. The highest possible pitch is G9; it is equal to 127. The lowest possible note is C_1 (C negative one); it is equal to 0.

C_1  = 0
CS_1 = 1
DF_1 = 1
D_1  = 2
DS_1 = 3
EF_1 = 3
E_1  = 4
ES_1 = 5
FF_1 = 4
F_1  = 5
FS_1 = 6
GF_1 = 6
G_1  = 7
GS_1 = 8
AF_1 = 8
A_1  = 9
AS_1 = 10
BF_1 = 10
B_1  = 11
BS_1 = 12
CF0  = 11
C0   = 12
CS0  = 13
DF0  = 13
D0   = 14
DS0  = 15
EF0  = 15
E0   = 16
ES0  = 17
FF0  = 16
F0   = 17
FS0  = 18
GF0  = 18
G0   = 19
GS0  = 20
AF0  = 20
A0   = 21
AS0  = 22
BF0  = 22
B0   = 23
BS0  = 24
CF1  = 23
C1   = 24
CS1  = 25
DF1  = 25
D1   = 26
DS1  = 27
EF1  = 27
E1   = 28
ES1  = 29
FF1  = 28
F1   = 29
FS1  = 30
GF1  = 30
G1   = 31
GS1  = 32
AF1  = 32
A1   = 33
AS1  = 34
BF1  = 34
B1   = 35
BS1  = 36
CF2  = 35
C2   = 36
CS2  = 37
DF2  = 37
D2   = 38
DS2  = 39
EF2  = 39
E2   = 40
ES2  = 41
FF2  = 40
F2   = 41
FS2  = 42
GF2  = 42
G2   = 43
GS2  = 44
AF2  = 44
A2   = 45
AS2  = 46
BF2  = 46
B2   = 47
BS2  = 48
CF3  = 47
C3   = 48
CS3  = 49
DF3  = 49
D3   = 50
DS3  = 51
EF3  = 51
E3   = 52
ES3  = 53
FF3  = 52
F3   = 53
FS3  = 54
GF3  = 54
G3   = 55
GS3  = 56
AF3  = 56
A3   = 57
AS3  = 58
BF3  = 58
B3   = 59
BS3  = 60
CF4  = 59
C4   = 60
CS4  = 61
DF4  = 61
D4   = 62
DS4  = 63
EF4  = 63
E4   = 64
ES4  = 65
FF4  = 64
F4   = 65
FS4  = 66
GF4  = 66
G4   = 67
GS4  = 68
AF4  = 68
A4   = 69
AS4  = 70
BF4  = 70
B4   = 71
BS4  = 72
CF5  = 71
C5   = 72
CS5  = 73
DF5  = 73
D5   = 74
DS5  = 75
EF5  = 75
E5   = 76
ES5  = 77
FF5  = 76
F5   = 77
FS5  = 78
GF5  = 78
G5   = 79
GS5  = 80
AF5  = 80
A5   = 81
AS5  = 82
BF5  = 82
B5   = 83
BS5  = 84
CF6  = 83
C6   = 84
CS6  = 85
DF6  = 85
D6   = 86
DS6  = 87
EF6  = 87
E6   = 88
ES6  = 89
FF6  = 88
F6   = 89
FS6  = 90
GF6  = 90
G6   = 91
GS6  = 92
AF6  = 92
A6   = 93
AS6  = 94
BF6  = 94
B6   = 95
BS6  = 96
CF7  = 95
C7   = 96
CS7  = 97
DF7  = 97
D7   = 98
DS7  = 99
EF7  = 99
E7   = 100
ES7  = 101
FF7  = 100
F7   = 101
FS7  = 102
GF7  = 102
G7   = 103
GS7  = 104
AF7  = 104
A7   = 105
AS7  = 106
BF7  = 106
B7   = 107
BS7  = 108
CF8  = 107
C8   = 108
CS8  = 109
DF8  = 109
D8   = 110
DS8  = 111
EF8  = 111
E8   = 112
ES8  = 113
FF8  = 112
F8   = 113
FS8  = 114
GF8  = 114
G8   = 115
GS8  = 116
AF8  = 116
A8   = 117
AS8  = 118
BF8  = 118
B8   = 119
BS8  = 120
CF9  = 119
C9   = 120
CS9  = 121
DF9  = 121
D9   = 122
DS9  = 123
EF9  = 123
E9   = 124
ES9  = 125
FF9  = 124
F9   = 125
FS9  = 126
GF9  = 126
G9   = 127