int buzzer = 23;
int boton1 = 22;
int boton2 = 21;
int boton3 = 19;
int boton4 = 18;
int boton5 = 5;
int boton6 = 17;
int boton7 = 16;
int boton8 = 4;

void setup() {
  
pinMode(buzzer, OUTPUT);
pinMode(boton1, INPUT_PULLUP);
pinMode(boton2, INPUT_PULLUP);
pinMode(boton3, INPUT_PULLUP);
pinMode(boton4, INPUT_PULLUP);
pinMode(boton5, INPUT_PULLUP);
pinMode(boton6, INPUT_PULLUP);
pinMode(boton7, INPUT_PULLUP);
pinMode(boton8, INPUT_PULLUP);
}


void loop() {
  
if(digitalRead(boton1) == LOW){ 
tone(buzzer, 261); 
delay(300);
}
if(digitalRead(boton2) == LOW){
tone(buzzer, 293); 
delay(300);
}
if(digitalRead(boton3) == LOW){ 
tone(buzzer, 329);
delay(300);
}
if(digitalRead(boton4) == LOW){
tone(buzzer, 349);
delay(300);
}
if(digitalRead(boton5) == LOW){
tone(buzzer, 392);
delay(300);
}
if(digitalRead(boton6) == LOW){ 
tone(buzzer, 440);
delay(300);
}
if(digitalRead(boton7) == LOW){ 
tone(buzzer, 493);
delay(300);
}
if(digitalRead(boton8) == LOW){
tone(buzzer, 523);
delay(300);
}
else{
noTone(buzzer);
delay(300);
}
}