acoustic grand          contrabass      lead 7 (fifths)
        bright acoustic     tremolo strings   lead 8 (bass+lead)
         electric grand   pizzicato strings      pad 1 (new age)
             honky-tonk  orchestral strings         pad 2 (warm)
       electric piano 1             timpani    pad 3 (polysynth)
       electric piano 2   string ensemble 1        pad 4 (choir)
            harpsichord   string ensemble 2        pad 5 (bowed)
                   clav      synthstrings 1     pad 6 (metallic)
                celesta      synthstrings 2         pad 7 (halo)
           glockenspiel          choir aahs        pad 8 (sweep)
              music box          voice oohs          fx 1 (rain)
             vibraphone         synth voice    fx 2 (soundtrack)
                marimba       orchestra hit       fx 3 (crystal)
              xylophone             trumpet    fx 4 (atmosphere)
          tubular bells            trombone    fx 5 (brightness)
               dulcimer                tuba       fx 6 (goblins)
          drawbar organ       muted trumpet        fx 7 (echoes)
       percussive organ         french horn        fx 8 (sci-fi)
             rock organ       brass section                sitar
           church organ        synthbrass 1                banjo
             reed organ        synthbrass 2             shamisen
              accordion         soprano sax                 koto
              harmonica            alto sax              kalimba
             concertina           tenor sax              bagpipe
acoustic guitar (nylon)        baritone sax               fiddle
acoustic guitar (steel)                oboe               shanai
 electric guitar (jazz)        english horn          tinkle bell
electric guitar (clean)             bassoon                agogo
electric guitar (muted)            clarinet          steel drums
      overdriven guitar             piccolo            woodblock
       distorted guitar               flute           taiko drum
       guitar harmonics            recorder          melodic tom
          acoustic bass           pan flute           synth drum
 electric bass (finger)        blown bottle       reverse cymbal
   electric bass (pick)          skakuhachi    guitar fret noise
          fretless bass             whistle         breath noise
            slap bass 1             ocarina             seashore
            slap bass 2     lead 1 (square)           bird tweet
           synth bass 1   lead 2 (sawtooth)       telephone ring
           synth bass 2   lead 3 (calliope)           helicopter
                 violin      lead 4 (chiff)             applause
                  viola    lead 5 (charang)              gunshot
                  cello      lead 6 (voice)
The first column is the integer value for the instrument. The second column tell the name of the note you should enter in the rhythm music object.
35 b,, Acoustic Bass Drum 59 b Ride Cymbal 2 36 c, Bass Drum 1 60 c' Hi Bongo 37 cis, Side Stick 61 cis' Low Bongo 38 d, Acoustic Snare 62 d' Mute Hi Conga 39 dis, Hand Clap 63 dis' Open High Conga 40 e, Electric Snare 64 e' Low Conga 41 f, Low Floor Tom 65 f' High Timbale 42 fis, Closed Hi Hat 66 fis' Low Timbale 43 g, High Floor Tom 67 g' High Agogo 44 gis, Pedal Hi Hat 68 gis' Agogo Low 45 a, Low Tom 69 a' Cabasa 46 ais, Open HiHat 70 ais' Maracas 47 b, Low-Mid Tom 71 b' Short Whistle 48 c Hi-Mid Tom 72 c'' Long Whistle 49 cis Crash Cymbal 1 73 cis'' Short Guiro 50 d High Tom 74 d'' Long Guiro 51 dis Ride Cymbal 1 75 dis'' Claves 52 e Chinese Cymbal 76 e'' Hi Wood Block 53 f Ride Bell 77 f'' Low Wood Block 54 fis Tambourine 78 fis'' Mute Cuica 55 g Splash Cymbal 79 g'' Open Cuica 56 gis Cowbell 80 gis'' Mute Triangle 57 a Crash Cymbal 2 81 a'' Open Triangle 58 ais Vibraslap