albums.php

<?php
if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            if (is_dir($file)) {
              echo "<h1>$file</h1>";
              $album = opendir($file);
              while (false !== ($song = readdir($album))) {
                $info = pathinfo($song);
                if ($info['extension'] == "mp3" || $info['extension'] == "ogg") {
                  echo "<div>$song<audio controls='controls' src=\"$file/$song\">";
                  echo "</audio></div>";
                }
              }
            }
        }
    }
    closedir($handle);
}
?>

Took out one line that had an unused variable assignment.