What role do HTTP headers play in the successful delivery and playback of MP3 files through PHP on a website?

HTTP headers play a crucial role in the successful delivery and playback of MP3 files through PHP on a website by specifying the content type of the file being served. Without proper headers, the browser may not interpret the file correctly, leading to issues with playback. To ensure smooth delivery and playback of MP3 files, it is important to set the appropriate content type header in PHP.

<?php
// Set the content type header for MP3 files
header('Content-Type: audio/mpeg');

// Output the MP3 file
readfile('example.mp3');
?>