Hi makenzi.exc,
Set the loop attribute in audio element.
Refer below example.
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body { font-family: Arial; font-size: 10pt; padding-left: 20px; }
</style>
</head>
<body>
<audio controls loop>
<source src="https://www.aspsnippets.com/audio/welcome.mp3" type="audio/mpeg">
</audio>
</body>
</html>
Demo
Screenshot

Downloads
Download Sample