Como fazer com que o som pare ao soltar o botão?

int ledred = 10;  
int ledgreen = 9; 
int som = 11;
int botao = 8;   
int botaoestado = 0;  

//copiado
const int melodia[] = {660,660,660,510,660,770,380,510,380,320,440,480,450,430,380,660,760,860,700,760,660,520,580,480,510,380,320,440,480,450,430,380,660,760,860,700,760,660,520,580,480,500,760,720,680,620,650,380,430,500,430,500,570,500,760,720,680,620,650,1020,1020,1020,380,500,760,720,680,620,650,380,430,500,430,500,570,585,550,500,380,500,500,500,500,760,720,680,620,650,380,430,500,430,500,570,500,760,720,680,620,650,1020,1020,1020,380,500,760,720,680,620,650,380,430,500,430,500,570,585,550,500,380,500,500,500,500,500,500,500,580,660,500,430,380,500,500,500,500,580,660,870,760,500,500,500,500,580,660,500,430,380,660,660,660,510,660,770,380};
const int duracaodasnotas[] = {100,100,100,100,100,100,100,100,100,100,100,80,100,100,100,80,50,100,80,50,80,80,80,80,100,100,100,100,80,100,100,100,80,50,100,80,50,80,80,80,80,100,100,100,100,150,150,100,100,100,100,100,100,100,100,100,100,150,200,80,80,80,100,100,100,100,100,150,150,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,150,150,100,100,100,100,100,100,100,100,100,100,150,200,80,80,80,100,100,100,100,100,150,150,100,100,100,100,100,100,100,100,100,100,100,100,100,60,80,60,80,80,80,80,80,80,60,80,60,80,80,80,80,80,60,80,60,80,80,80,80,80,80,100,100,100,100,100,100,100};
//fim da cópia

void setup(){
  pinMode(ledred, OUTPUT);  
  pinMode(ledgreen, OUTPUT);
  pinMode(som, OUTPUT); 
  pinMode(botao, INPUT); 
}

void loop(){
  botaoestado = digitalRead(botao);
  while(botaoestado == HIGH){ //AQUI... assim ele toca sempre um ciclo de música completo enquanto o botão estiver pressionado.   
 
    digitalWrite(ledred, HIGH); 
    digitalWrite(ledgreen, LOW); 
    //copiado
    for (int nota = 0; nota < 156; nota++) {  //se colocares o while aqui, ele só toca mesmo enquanto o botão estiver pressionado... 
              int duracaodanota = duracaodasnotas[nota];
              tone(som, melodia[nota],duracaodanota); 
              int pausadepoisdasnotas[] ={150,300,300,100,300,550,575,450,400,500,300,330,150,300,200,200,150,300,150,350,300,150,150,500,450,400,500,300,330,150,300,200,200,150,300,150,350,300,150,150,500,300,100,150,150,300,300,150,150,300,150,100,220,300,100,150,150,300,300,300,150,300,300,300,100,150,150,300,300,150,150,300,150,100,420,450,420,360,300,300,150,300,300,100,150,150,300,300,150,150,300,150,100,220,300,100,150,150,300,300,300,150,300,300,300,100,150,150,300,300,150,150,300,150,100,420,450,420,360,300,300,150,300,150,300,350,150,350,150,300,150,600,150,300,350,150,150,550,325,600,150,300,350,150,350,150,300,150,600,150,300,300,100,300,550,575};
              delay(pausadepoisdasnotas[nota]);}
              //fim da cópia
  }else{
    digitalWrite(10, 0);
    digitalWrite(9, 1);    
  }
}

Vê as notas no código.

Atenta que provavelmente estás a usar memória a mais com esses vectores. Tenta passar isso para código com o const como fiz nos dois primeiros vectores