The REST API provides the title, artist, album, and picture for each track. However, I don't see any way to retrieve the track number.
I know that OneDrive has this information:
Is it possible to retrieve a track number for a song directly from OneDrive? Or do I need to parse the id3 tags myself, despite other relevant metadata being available through the LiveConnect API?
Based on the returned audio object reference, it doesn't appear to be a provided field in the response.