How can I stop music with a push button?

I would like to know how to stop music with a push button (to stop it exactly at the moment you press the button). Because at the moment my code does what I want(stop the music and turn on a light when I press the press button, but it waits untill the end of the song to stop. There is my code:

  int buttonState = 0;
  int speakerOut = 10;
  int buttonPin= 7;
  int frequency = 500;
  int ledPin = 13;
  int length = 17; // the number of notes
  char notes[] = "gcefgcefgcefgcefga "; // a space represents a rest
  //int beats[] = {2,2,1,1,2,2,1,1,2,2,1,1,2,2,1,1};
  //int tempo = 250;
  int DEBUG = 1;
  #define  c     3830    
  #define  d     3400     
  #define  e     3038   
  #define  f     2864    
  #define  g     2550    
  #define  a     2272    
  #define  b     2028  
  #define  C     1912    
  #define  R     0

  void setup() {
    // put your setup code here, to run once:

    pinMode(ledPin, OUTPUT);
    pinMode(buttonPin,INPUT);
    pinMode(speakerOut, OUTPUT);
    if (DEBUG) { 
      Serial.begin(9600); // Set serial out if we want debugging
    } 
  }

  // MELODY and TIMING  =======================================
  //  melody[] is an array of notes, accompanied by beats[], 
  //  which sets each note's relative length (higher #, longer note) 
  int melody[] = {  C,  b,  g,  C,  b,   e,  R,  C,  c,  g, a, C };
  int beats[]  = { 16, 16, 16,  8,  8,  16, 32, 16, 16, 16, 8, 8 }; 
  int MAX_COUNT = sizeof(melody) / 2; // Melody length, for looping.

  // Set overall tempo
  long tempo = 10000;
  // Set length of pause between notes
  int pause = 1000;
  // Loop variable to increase Rest length
  int rest_count = 100; //<-BLETCHEROUS HACK; See NOTES

  // Initialize core variables
  int tone_ = 0;
  int beat = 0;
  long duration  = 0;

  // PLAY TONE  ==============================================
  // Pulse the speaker to play a tone for a particular duration
  void playTone() {
    long elapsed_time = 0;
    if (tone_ > 0) { // if this isn't a Rest beat, while the tone has 
      //  played less long than 'duration', pulse speaker HIGH and LOW
      while (elapsed_time < duration) {

        digitalWrite(speakerOut,HIGH);
        delayMicroseconds(tone_ / 2);

        // DOWN
        digitalWrite(speakerOut, LOW);
        delayMicroseconds(tone_ / 2);

        // Keep track of how long we pulsed
        elapsed_time += (tone_);
      } 
    }
    else { // Rest beat; loop times delay
      for (int j = 0; j < rest_count; j++) { // See NOTE on rest_count
        delayMicroseconds(duration);  
      }                                
    }                                 
  }


  void loop() {
    // put your main code here, to run repeatedly:
    buttonState = digitalRead(buttonPin);
    if (buttonState==HIGH){
      digitalWrite(ledPin, HIGH);
      noTone(speakerOut);
    }else {
      digitalWrite(ledPin, LOW);
      digitalWrite(speakerOut,HIGH);
        for (int i=0; i<MAX_COUNT; i++) {
      tone_ = melody[i];
      beat = beats[i];

      duration = beat * tempo; // Set up timing

      playTone(); 
      // A pause between notes...
      delayMicroseconds(pause);

        }
    }  }