The button Works

int sensorValue;
int sensorHigh        = 0;
int sensorLow         = 1023;
int curButState       = 1;
int lastButState      = 1;

const int button      = 7;
const int ledPin      = 13;

bool Switch           = false;

void setup() {
  // put your setup code here, to run once:
  pinMode(button, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);
  while (millis() < 5000) {
    sensorValue = analogRead(A0);
    if (sensorValue > sensorHigh) {
      sensorHigh = sensorValue;
    } if (sensorValue < sensorLow) {
      sensorLow = sensorValue;
    }
  }
  digitalWrite(ledPin, LOW);
  Serial.begin(9600);
  Serial.println("running");

}

void loop() {
  // put your main code here, to run repeatedly:
  sensorValue = analogRead(A0);
  int pitch = map(sensorValue, sensorLow, sensorHigh, 50, 4000);
  //This line checks of the varable [switch] is TRUE or FALSE.
  //IF true then it runs the code inside the if statment.
  //IF false, then it runs the code in the else statment, just turning the speaker OFF.
  if (buttonReading()) {
    tone(8, pitch, 20);
    delay(10);
  } else {
    digitalWrite(8, LOW);
  }

  Serial.println(Switch);
}
//This is a new function I created just to handle the button operation:
//I created it into a BOOL so it will just be true false.
bool buttonReading() {
  //here I read the button, remember LOW means the button is pressed down, HIGH means its released.
  curButState = digitalRead(button);
  //Same as you had, bur I swaped the HIGH, LOW. So it not detects if the button WAS not pressed
  //And is now pressed.
  if (lastButState == HIGH && curButState == LOW) {
    Serial.println("button is pressed");
    //This switch statment changes state any time this code is active it changes to the opisit of what it was.
    Switch = !Switch;
    Serial.println(Switch);
    //Here we store nte new value of the button
    lastButState = curButState;
    //This line sends info to ANY code that calls this function, I am sending the varable SWITCH [true or fales only.]
    return (Switch);
  }
  lastButState = curButState;
}