title: Personal OneDrive Audio Facet returns null for various audio files
body: <p>I am using the v1.0 Graph API to query a Personal OneDrive account. In the Graph Explorer, I make the following GET request for two separate audio files (one is an mp3 and the other is an m4a):</p>
  
  <pre><code>https://graph.microsoft.com/v1.0/me/drive/items/{item-id}
  </code></pre>
  
  <p>For both files, this returns all of the default properties (Name, ID, Size, etc.). However, it does not return the Audio Facet as one would expect. The mp3 file for sure has metadata such as Album, Artist, and Genre amongst other things.</p>
  
  <p>Is the Audio Facet only attached to certain audio file extensions? Might this be related to a permissions setting?</p>