#include 
Tone sound;
int btn1=3;
int btn2=4;
int btn3=5;
int btn4=6;
int btn5=7;        
int btn6=8;
int btn7=9;
 int notes[] = {
   NOTE_B4, NOTE_C5,NOTE_CS5,NOTE_D5,NOTE_DS5,NOTE_E5,NOTE_F5};
 
void setup(){
  Serial.begin(9600);
   
  sound.begin(11);
  sound.play(notes[0]);
    delay(60);
    sound.stop();
pinMode(btn1,INPUT);
pinMode(btn2,INPUT);
pinMode(btn3,INPUT);
pinMode(btn4,INPUT);       
pinMode(btn5,INPUT);                      
pinMode(btn6,INPUT);
pinMode(btn7,INPUT);
digitalWrite(btn1,HIGH);
digitalWrite(btn2,HIGH);
digitalWrite(btn3,HIGH);
digitalWrite(btn4,HIGH);
digitalWrite(btn5,HIGH);
digitalWrite(btn6,HIGH);
digitalWrite(btn7,HIGH);

}
void loop(){
  if(!digitalRead(btn1)){
    Serial.println("here");
    sound.play(notes[0]);
    delay(60);
    sound.stop();
  }
  if(!digitalRead(btn2)){
    sound.play(notes[1]);
    delay(60);
    sound.stop();
  }
  if(!digitalRead(btn3)){
    sound.play(notes[2]);
    delay(60);
    sound.stop();
  }
  if(!digitalRead(btn4)){
    sound.play(notes[3]);
    delay(60);
    sound.stop();
  }
  if(!digitalRead(btn5)){
    sound.play(notes[4]);
    delay(60);
    sound.stop();
  }
  if(!digitalRead(btn6)){
    sound.play(notes[5]);
    delay(60);
    sound.stop();
  }
  if(!digitalRead(btn7)){
    sound.play(notes[6]);
    delay(60);
    sound.stop();
  }
}