Snippet of code to easily play a song on an Arduino

arduino_song.c

#define PITCH_B0  31
#define PITCH_C1  33
#define PITCH_CS1 35
#define PITCH_D1  37
#define PITCH_DS1 39
#define PITCH_E1  41
#define PITCH_F1  44
#define PITCH_FS1 46
#define PITCH_G1  49
#define PITCH_GS1 52
#define PITCH_A1  55
#define PITCH_AS1 58
#define PITCH_B1  62
#define PITCH_C2  65
#define PITCH_CS2 69
#define PITCH_D2  73
#define PITCH_DS2 78
#define PITCH_E2  82
#define PITCH_F2  87
#define PITCH_FS2 93
#define PITCH_G2  98
#define PITCH_GS2 104
#define PITCH_A2  110
#define PITCH_AS2 117
#define PITCH_B2  123
#define PITCH_C3  131
#define PITCH_CS3 139
#define PITCH_D3  147
#define PITCH_DS3 156
#define PITCH_E3  165
#define PITCH_F3  175
#define PITCH_FS3 185
#define PITCH_G3  196
#define PITCH_GS3 208
#define PITCH_A3  220
#define PITCH_AS3 233
#define PITCH_B3  247
#define PITCH_C4  262
#define PITCH_CS4 277
#define PITCH_D4  294
#define PITCH_DS4 311
#define PITCH_E4  330
#define PITCH_F4  349
#define PITCH_FS4 370
#define PITCH_G4  392
#define PITCH_GS4 415
#define PITCH_A4  440
#define PITCH_AS4 466
#define PITCH_B4  494
#define PITCH_C5  523
#define PITCH_CS5 554
#define PITCH_D5  587
#define PITCH_DS5 622
#define PITCH_E5  659
#define PITCH_F5  698
#define PITCH_FS5 740
#define PITCH_G5  784
#define PITCH_GS5 831
#define PITCH_A5  880
#define PITCH_AS5 932
#define PITCH_B5  988
#define PITCH_C6  1047
#define PITCH_CS6 1109
#define PITCH_D6  1175
#define PITCH_DS6 1245
#define PITCH_E6  1319
#define PITCH_F6  1397
#define PITCH_FS6 1480
#define PITCH_G6  1568
#define PITCH_GS6 1661
#define PITCH_A6  1760
#define PITCH_AS6 1865
#define PITCH_B6  1976
#define PITCH_C7  2093
#define PITCH_CS7 2217
#define PITCH_D7  2349
#define PITCH_DS7 2489
#define PITCH_E7  2637
#define PITCH_F7  2794
#define PITCH_FS7 2960
#define PITCH_G7  3136
#define PITCH_GS7 3322
#define PITCH_A7  3520
#define PITCH_AS7 3729
#define PITCH_B7  3951
#define PITCH_C8  4186
#define PITCH_CS8 4435
#define PITCH_D8  4699
#define PITCH_DS8 4978

#define SIXTENTH_NOTE 32
#define EIGHTH_NOTE 16
#define QUARTER_NOTE 4
#define HALF_NOTE 2
#define WHOLE_NOTE 1

/**
* Plays a song through the speaker connected to "speaker_pin". The pitches array is an array of note pitches,
* and the durations array is an array of the same size describing the duration of said pitches (quarter, half note, etc.)
* Size is the amount of notes, tempo is the tempo of the song (in BPM). The time_signature_numerator allows specifying if
* the song is in 4/4, 3/4, etc.
*/
void playSong(int speaker_pin, int pitches[], int durations[], int size, int tempo, int time_signature_numerator) {
  int note_duration;
  int measure_duration = ((60.0 / tempo) * 1.0 * time_signature_numerator) * 1000;
  
  for(int i = 0; i < size; i++) {
    note_duration = measure_duration * (1.0 / durations[i]);
    
    tone(speaker_pin, pitches[i], note_duration);
    delay(1.3 * note_duration);
    noTone(speaker_pin);
  }
}