What is the actionscript that receives the music info from those standby menus?
Taking a look at some commercial SE standby swfs, it looks like the key to displaying music information is the following command:
However, it seems as though this function is only supported in phones that run walkman player 2.0 [credit: peter3334], which are usually the phones that are able to run wallpapers. From here, it looks as though the variables imported are: TITLE, ARTIST and ALBUM. The actionscript associated with displaying, updating and formatting this information definitely seems more complicated than the ordinary flash lite menu...