Pre-order Just Dance 4 for the Wii, Xbox 360, PlayStation 3, or Wii U at EBGames in Canada and receive a PIN code for five free bonus MP3 tracks.

So far, there does not appear to be any specification of which songs/artists are included in the five bonus MP3 tracks.

Just Dance 4 will be available on October 9th, 2012 for the Xbox 360, Wii, and PlayStation 3, with the Wii U release date to be announced.