In a similar fashion to og:video you can add an audio file to your markup:
og:audio - e.g., "http://example.com/amazing.mp3" and optionally
og:audio:title - e.g. "Amazing Soft Rock Ballad"og:audio:artist - e.g. "Amazing Band"og:audio:album - e.g. "Amazing Album"og:audio:type - e.g. "application/mp3"For example:
<html xmlns:og="http://ogp.me/ns#">
<head>
...
[REQUIRED TAGS]
<meta property="og:audio" content="http://example.com/awesome.mp3" />
<meta property="og:audio:title" content="Awesome Song" />
<meta property="og:audio:artist" content="Awesome Band" />
<meta property="og:audio:album" content="Totally Awesome Album" />
<meta property="og:audio:type" content="application/mp3" />
...
</head>