.c

#define NOTE_A2 110
#define NOTE_B2 123
#define NOTE_C3 131
#define NOTE_D3 147
#define NOTE_E3 165
#define NOTE_F3 175
#define NOTE_G3 196
#define speaker 2
#define keys 30
#define play 6
#define maxnotes 100
int tones[7]={NOTE_A2,NOTE_B2,NOTE_C3,NOTE_D3,NOTE_E3,NOTE_F3,NOTE_G3};
void setup() {
  Serial.begin(9600);
  Serial.println("hi");
  //pinMode(keys,INPUT);
}

int waitcount(int i){
  int j=0;
  while(digitalRead(keys+i)){
    j++;
    tone(speaker,tones[i]);
  }
  return j;
}
int notes[maxnotes];
int times[maxnotes];
int j;
void loop() {
  startup:
  j=0;
  tone(speaker,NOTE_A2,100);
  delay(100);
  tone(speaker,NOTE_G3,100);
  delay(100);
  //delay(1000);
  writeloop:
    for(int i=0;i<8;i++){
      if(digitalRead(keys+i)){
        notes[j]=i;
        times[j]=waitcount(i)/5;
        if(times[j]<25){
          times[j]=25;
        }
        j++;
        noTone(speaker);
      }
    }
    if(digitalRead(play)){
      while(digitalRead(play)){delay(10);}
      goto playloop;
    }
  goto writeloop;
  playloop:
    for(int i=0;i<j;i++){
      tone(speaker,tones[notes[i]]);
      delay(times[i]);
      if(times[i]<50){
        noTone(speaker);
        delay(50-times[i]);
      }
      noTone(speaker);
      if(digitalRead(play)){
        goto startup;
      }
    }
  goto writeloop;
}