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code: [ File > Examples > Digital > toneMelody ]

 /*
   Melody
  
  Plays a melody 
  
  circuit:
  * 8-ohm speaker on digital pin 8
  
  created 21 Jan 2010
  by Tom Igoe 
  
  http://arduino.cc/en/Tutorial/Tone
  
  */
  #include "pitches.h"
 
 // notes in the melody:
 int melody[] = {
   NOTE_C4, NOTE_G3,NOTE_G3, NOTE_A3, NOTE_G3,0, NOTE_B3, NOTE_C4};
 
 // note durations: 4 = quarter note, 8 = eighth note, etc.:
 int noteDurations[] = {
   4, 8, 8, 4,4,4,4,4 };
 
 void setup() {
   // iterate over the notes of the melody:
   for (int thisNote = 0; thisNote < 8; thisNote++) {
 
     // to calculate the note duration, take one second 
     // divided by the note type.
     //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
     int noteDuration = 1000/noteDurations[thisNote];
     tone(8, melody[thisNote],noteDuration);
 
     // to distinguish the notes, set a minimum time between them.
     // the note's duration + 30% seems to work well:
     int pauseBetweenNotes = noteDuration * 1.30;
     delay(pauseBetweenNotes);
   }
 }
 
 void loop() {
   // no need to repeat the melody.
 }