Was chatting with a user that was trying to upload an mp3 file to a gallery, but that doesn't seem to be allowed. Documentation only talks about images and video so my guess is that it isn't supported yet.
However, the upload field has this text under it:
"Allowed file types: jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp mp3 mov m4v mp4 mpeg avi ogg wmv ico."
Audio formats are listed as allowed formats.