 
 void reset_arms()
 {
-  // Sets left_arm and right_arm at their min and max values.
+  // Sets left_arm and right_arm to their min and max values.
   pwm.setPWM(left_arm, 0, LEFT_ARM_OPEN);
   pwm.setPWM(right_arm, 0, RIGHT_ARM_OPEN);
 }
 
 void reset_ears()
 {
-  // Sets left_ear and right_ear at the middle.
+  // Sets left_ear and right_ear to the middle.
   pwm.setPWM(left_ear, 0, MIDDLE_EAR);
   pwm.setPWM(right_ear, 0, MIDDLE_EAR);
 }
 
-void play_song()
+void play_song(int song_number)
 {
   // 26 notes long
   for ( int i = 0; i < 26; i++ )
   {
-    int note_length = 1000 / mary_had_a_little_lamb_lengths[i];
-    tone(speakerPin, mary_had_a_little_lamb_notes[i], note_length);
+    if ( song_number == 0 )
+    {
+      int note_length = 1000 / mary_had_a_little_lamb_lengths[i];
+      tone(speakerPin, mary_had_a_little_lamb_notes[i], note_length);
+    }
     
     int pause_between_notes = note_length * 1.30;
     delay(pause_between_notes);

int kissed_flag = 0;
int normal_light_flag = 0;

int photocellPin = A5;     // the cell and 10K pulldown are connected to a0
int photocellReading;     // the analog reading from the sensor divider
int LEDpin = 11;          // connect Red LED to pin 11 (PWM pin)
int LEDbrightness;

int speakerPin = 12;
int numTones = 10;
int tones[] = {261, 277, 294, 311, 330, 349, 370, 392, 415, 440};
//            mid C  C#   D    D#   E    F    F#   G    G#   A

int mary_had_a_little_lamb_notes[] = {
  NOTE_E4, NOTE_D4, NOTE_C4, NOTE_D4, NOTE_E4, NOTE_E4, NOTE_E4, NOTE_D4, NOTE_D4, NOTE_D4, NOTE_E4, NOTE_E4, NOTE_E4, NOTE_E4, NOTE_D4, NOTE_C4, NOTE_D4, NOTE_E4, NOTE_E4, NOTE_E4, NOTE_E4, NOTE_D4, NOTE_D4, NOTE_E4, NOTE_D4, NOTE_C4
};

#include <Adafruit_PWMServoDriver.h>
#include <Wire.h>

#include "pitches.h"

// Uses the default address 0x40.
Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver();

// These are the minimum and maximum pulse length counts (out of 4096) for our servos.
#define BIG_SERVO_MIN 160
#define BIG_SERVO_MAX 584
#define MICRO_SERVO_MIN 160
#define MICRO_SERVO_MAX 584

