Song.h

class Song {

  public:
    int currentNote = 0;
    int base = 400;
    static const int len = 32;
    int notes[len][2] = {
      {0, 450},
      {-100, 50},
      {0, 250},
      {2, 750},
      {0, 750},
      {5, 750},
      {4, 1250},
      {-100, 250},
      {0, 450},
      {-100, 50},
      {0, 250},
      {2, 750},
      {0, 750},
      {7, 750},
      {5, 1250},
      {-100, 250},
      {0, 450},
      {-100, 50},
      {0, 250},
      {12, 750},
      {9, 750},
      {5, 750},
      {4, 750},
      {2, 1250},
      {-100, 250},
      {10, 450},
      {-100, 50},
      {10, 250},
      {9, 750},
      {5, 750},
      {7, 750},
      {5, 1250},
    };

    Song() {
      currentNote = 0;
    }

    int nextNote() {
      if (notes[currentNote][0] == -100) {
        return 0;
      }
      return base * pow(2, notes[currentNote][0]/12.0);
    }

    int nextLength() {
      currentNote++;
      return notes[currentNote-1][1];
    }

    boolean completed() {
      return currentNote == len;
    }

    void reset() {
      currentNote = 0;
    }

};