Fixed an oopsie, removed a vestigial flag, and added some comments.

lab_2/main.c

@@ -7,8 +7,6 @@
 
 #include "main.h"
 
-bool play_flag = 0;
-
 /*
  * Pin Definitions:
  * PB2 -> OC0A output
@@ -104,19 +102,14 @@ bool play_beat() {
 
 int main(void)
 {
+    // Run initialisation functionality
 	gpio_init();
 	timer_init();
 
-	beat_t beat = {
-		.note = a,
-		.duration = 20,
-		.octave = 0,
-	};
-	play_note(beat, 1);
-
     while (1) 
     {
 
+        // Wait for button press
 		if (bit_is_clear(PIND, PIND2)) {
 			// Play song until the end
 			while(play_beat());