Piezo Keyboard notes

const int buttonpin=A0;
const int piezzo=8;
int ReadValue;
int toneval;

void setup()
{
  // imstupid
  pinMode (buttonpin,INPUT);
  pinMode (piezzo,OUTPUT);
  Serial.begin (9600);

}

void loop()
{
  toneval=0;
  ReadValue=analogRead (buttonpin);
  Serial.println (ReadValue);
  //tone (piezzo,ReadValue,200);
  if (ReadValue>300 && ReadValue<350)
  {
    toneval=261;
  }
  if (ReadValue>80 && ReadValue<110)
  {
    toneval=294;
  }
  if (ReadValue>200 && ReadValue<270)
  {
    toneval=330;
  }
  if (ReadValue>900)
  {
    toneval=392;
  }
  tone (piezzo,toneval,200);

}