When using MIDI channel 9 (the MIDI protocol has 16 channels, numbered 0–15), each pitch corresponds to a different drum sound.

The music library defines the following drum sound constants for convenience. According to the MIDI standard, only pitches 35 to 81 are defined.

ABD, ACOUSTIC_BASS_DRUM = 35
BDR, BASS_DRUM = 36
STK, SIDE_STICK = 37
SNR, SNARE = 38
CLP, HAND_CLAP = 39
ESN, ELECTRIC_SNARE = 40
LFT, LOW_FLOOR_TOM = 41
CHH, CLOSED_HI_HAT = 42
HFT, HIGH_FLOOR_TOM = 43
PHH, PEDAL_HI_HAT = 44
LTM, LOW_TOM = 45
OHH, OPEN_HI_HAT = 46
LMT, LOW_MID_TOM = 47
HMT, HI_MID_TOM = 48
CC1, CRASH_CYMBAL_1 = 49
HGT, HIGH_TOM = 50
RC1, RIDE_CYMBAL_1 = 51
CCM, CHINESE_CYMBAL = 52
RBL, RIDE_BELL = 53
TMB, TAMBOURINE = 54
SCM, SPLASH_CYMBAL = 55
CBL, COWBELL = 56
CC2, CRASH_CYMBAL_2 = 57
VSP, VIBRASLAP = 58
RC2, RIDE_CYMBAL_2 = 59
HBG, HI_BONGO = 60
LBG, LOW_BONGO = 61
MHC, MUTE_HI_CONGA = 62
OHC, OPEN_HI_CONGA = 63
LCG, LOW_CONGA = 64
HTI, HIGH_TIMBALE = 65
LTI, LOW_TIMBALE = 66
HAG, HIGH_AGOGO = 67
LAG, LOW_AGOGO = 68
CBS, CABASA = 69
MRC, MARACAS = 70
SWH, SHORT_WHISTLE = 71
LWH, LONG_WHISTLE = 72
SGU, SHORT_GUIRO = 73
LGU, LONG_GUIRO = 74
CLA, CLAVES = 75
HWB, HI_WOOD_BLOCK = 76
LWB, LOW_WOOD_BLOCK = 77
MCU, MUTE_CUICA = 78
OCU, OPEN_CUICA = 79
MTR, MUTE_TRIANGLE = 80
OTR, OPEN_TRIANGLE = 81