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 xspf_plgen_get_xspf_permalink() in xspf-plgen-templates.php.
See function xspf_plgen_get_tomahk_playlist() in xspf-plgen-templates.php. You could also be interested by the functions xspf_plgen_get_tomahk_playlist_link() and xspf_plgen_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.