#define NOTE_C4  262
#define NOTE_D4  294
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_G4  392
#define NOTE_A4  440
#define NOTE_B4  494
#define SPEAKER_PIN 8

#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

int tune_01[] = {NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4, NOTE_G4, NOTE_A4, NOTE_B4};
int note_time = 300;
int gap_time = 100;
int no_notes = 7; //the number of notes in the tunes array
int potentiometer_pin = A0;
int potentiometer_value;

void setup() {
  lcd.init();
  lcd.backlight();

  lcd.setCursor(7,0);
  lcd.print("Hello!");
  lcd.setCursor(3,1);
  lcd.print("Move The Slider");
  lcd.setCursor(4,2);
  lcd.print("To Play Notes");
  lcd.setCursor(6,3);
  lcd.print("Of A Song!");
  potentiometer_value = analogRead(potentiometer_pin);
  pinMode(SPEAKER_PIN, OUTPUT);
}

void loop() {
  potentiometer_value = analogRead(potentiometer_pin);
  note_time = map(potentiometer_value, 100, 500, 100,500);

  for (int i = 0; i < no_notes; i++) {
  tone(SPEAKER_PIN, tune_01[i], note_time);
delay(note_time+gap_time);
  }
}