Shoutbox

I use Now Playing script... I also translated it in italian... but I haven't understand some its functions..

For example, if I use Winamp, in my PSM appears this string:

  I'm listening: TITLE - [ARTIST] - ALBUM

If I use Windows Media Player, all song information don't appear... So it is:

  I'm listening: - [] -

I correctly select the player that provides song information... why?? Can anyone help me?