Twinkle Twinkle - Using Button Input

For this project we were learning how to take input from a button and write a program that uses this input to make something happen. I chose to allow a user to play the song "Twinkle Twinkle Little Star" by pressing a single button repeatedly. The breadboard setup is simple. I rigged 6 lights parallel through a single resistor and out to ground. The button has a constant charge being output to it which allows the pin to read when it has been grounded by the button being pressed.

The code is below. It's long, but because I did a long song, this was unavoidable. It is mostly repetition.


const int buttonPin = 2;
const int led1 = 3;
const int led2 = 4;
const int led3 = 5;
const int led4 = 6;
const int led5 = 7;
const int led6 = 8;
int musicMarker = 0;
int note = 0;
int buttonDelay = 50;
int lightDelay = 100;

void setup(){
 
  Serial.begin(9600);
  pinMode(buttonPin, INPUT);
  digitalWrite(buttonPin, HIGH);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
 
}

void loop(){
 
  if(digitalRead(buttonPin)==0){
    musicMarker ++;
    delay(buttonDelay);
    }
  if(musicMarker == 1){
    note = 1;
  }else if(musicMarker == 2){
    note = 1;
  }else if(musicMarker == 3){
    note = 5;
  }else if(musicMarker == 4){
    note = 5;
  }else if(musicMarker == 5){
    note = 6;
  }else if(musicMarker == 6){
    note = 6;
  }else if(musicMarker == 7){
    note = 5;
  }else if(musicMarker == 8){
    note = 4;
  }else if(musicMarker == 9){
    note = 4;
  }else if(musicMarker == 10){
    note = 3;
  }else if(musicMarker == 11){
    note = 3;
  }else if(musicMarker == 12){
    note = 2;
  }else if(musicMarker == 13){
    note = 2;
  }else if(musicMarker == 14){
    note = 1;
  }else if(musicMarker == 15){
    note = 5;
  }else if(musicMarker == 16){
    note = 5;
  }else if(musicMarker == 17){
    note = 4;
  }else if(musicMarker == 18){
    note = 4;
  }else if(musicMarker == 19){
    note = 3;
  }else if(musicMarker == 20){
    note = 3;
  }else if(musicMarker == 21){
    note = 2;
  }else if(musicMarker == 22){
    note = 5;
  }else if(musicMarker == 23){
    note = 5;
  }else if(musicMarker == 24){
    note = 4;
  }else if(musicMarker == 25){
    note = 4;
  }else if(musicMarker == 26){
    note = 3;
  }else if(musicMarker == 27){
    note = 3;
  }else if(musicMarker == 28){
    note = 2;
  }else if(musicMarker == 29){
    note = 1;
  }else if(musicMarker == 30){
    note = 1;
  }else if(musicMarker == 31){
    note = 5;
  }else if(musicMarker == 32){
    note = 5;
  }else if(musicMarker == 33){
    note = 6;
  }else if(musicMarker == 34){
    note = 6;
  }else if(musicMarker == 35){
    note = 5;
  }else if(musicMarker == 36){
    note = 4;
  }else if(musicMarker == 37){
    note = 4;
  }else if(musicMarker == 38){
    note = 3;
  }else if(musicMarker == 39){
    note = 3;
  }else if(musicMarker == 40){
    note = 2;
  }else if(musicMarker == 41){
    note = 2;
  }else if(musicMarker == 42){
    note = 1;
  }else{
    note = 0;
    musicMarker = 0;
  }
   
  if(note == 1){
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    delay(lightDelay);
    digitalWrite(led1, LOW);
  }else if(note == 2){
    digitalWrite(led1, LOW);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    delay(lightDelay);
    digitalWrite(led2, LOW);
  }else if(note == 3){
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    delay(lightDelay);
    digitalWrite(led3, LOW);
  }else if(note == 4){
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, HIGH);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    delay(lightDelay);
    digitalWrite(led4, LOW);
  }else if(note == 5){
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, HIGH);
    digitalWrite(led6, LOW);
    delay(lightDelay);
    digitalWrite(led5, LOW);
  }else if(note == 6){
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, HIGH);
    delay(lightDelay);
    digitalWrite(led6, LOW);
  }else{
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
  }
 
}