iTunesControl: iTunes, Improved.

This sets what will appear on the OSD.

You can use the following constants:
• %artist% - Current artist, or "(none)" if no current artist
• %track% - Current track title, or "(none)" if no current track title
• %album% - Current album, or "(none)" if no current album
• %rating% - Current rating, displayed using "*" for each star of rating
• %tags% - Shows any tags set for the current track
• %tracknumber% - Track number for current track
• %track_length% - Total length of current track
• %bit_rate% - Bit rate for current track
• %total_tracks% - Total number of tracks for current album
• %composer% - Composer for current track, or "(none)" if no composer
• %normalize% - Per-track volume adjustment value