Parse tracklists from websites and generate a dynamic XSPF file out of it; and embed it as a Toma.hk playlist in your post.
See function xspfpl_get_xspf_permalink() in xspfpl-templates.php.
See function xspfpl_get_tomahk_playlist() in xspfpl-templates.php. You could also be interested by the functions xspfpl_get_tomahk_playlist_link() and xspfpl_get_tomahk_playlist_id() of the same file.
This last function is also responsible for the submission of the XSPF file to Toma.hk : it sends the XSPF file to Toma.hk, returns the Toma.hk playlist ID, and stores it as a post meta. So the XSPF is only sent the first time; next time the value from the post meta is retrieved.