World's silliest arduino-based electronic musical instrument

This is the world's silliest arduino-based electronic musical instrument. It is a mashup of the "Melody" tutorial and the "Button" tutorial.  The code I modified (see below) strips out the part where the tune is actually played and instead plays a single note when each button is pressed.

/* Melody
 * (cleft) 2005 D. Cuartielles for K3
 *
 * This example uses a piezo speaker to play melodies.  It sends
 * a square wave of the appropriate frequency to the piezo, generating
 * the corresponding tone.
 *
 * The calculation of the tones is made following the mathematical
 * operation:
 *
 *       timeHigh = period / 2 = 1 / (2 * toneFrequency)
 *
 * where the different tones are described as in the table:
 *
 * note  frequency  period  timeHigh
 * c          261 Hz          3830  1915  
 * d          294 Hz          3400  1700  
 * e          329 Hz          3038  1519  
 * f          349 Hz          2864  1432  
 * g          392 Hz          2550  1275  
 * a          440 Hz          2272  1136  
 * b          493 Hz          2028 1014 
 * C         523 Hz         1912  956
 *
 * http://www.arduino.cc/en/Tutorial/Melody
 */
  
int speakerPin = 9;
int button1 = 3;
int button2 = 4;
int button3 = 5;

int val1 = 0;
int val2 = 0;
int val3 = 0;

int length = 15; // the number of notes
char notes[] = "ccggaagffeeddc "; // a space represents a rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };
int tempo = 300;

void playTone(int tone, int duration) {
  for (long i = 0; i < duration * 1000L; i += tone * 2) {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);
  }
}

void playNote(char note, int duration) {
  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
  
  // play the tone corresponding to the note name
  for (int i = 0; i < 8; i++) {
    if (names[i] == note) {
      playTone(tones[i], duration);
    }
  }
}

void setup() {
  pinMode(speakerPin, OUTPUT);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
}

void loop() {
  val1 = digitalRead(button1);
  val2 = digitalRead(button2);
  val3 = digitalRead(button3);
    if (val1 == LOW) {
      playNote('c', 1 * tempo);
//    } else {
//      playNote(notes[i], beats[i] * tempo);
    }
if (val2 == LOW) {
      playNote('e', 1 * tempo);
}
    if (val3 == LOW) {
      playNote('g', 1 * tempo);  
}

}