So Massive has pointed me to the official site of the Polo PSP, where the song runs in the background:
Official Polo PSP Site (Look for the Polo PSP image

But you can also hear the song here (via www.musiquedepub.com):

Both sources are of lousy quality, but you really get the idea and it seems to be a real hard-hitter for the next party. Just keeping an ear out for a hi-fi version.

So it seems that the song is an original composition specially made for the spot by a young belgian artist who goes by the name of JohanSebastian. You can check this thread (in french) on www.musiquedepub.com for updates. As it seems the artist is doing a 3min compo that will be available for download in a week or so. This is something pretty exciting stuff happening there. Perhaps the birth of a new belgian star (ie.: Goose, Riot in Belgium, etc.)

Here is, to keep you entertained, the very cool and sleazy electro track “La musique” by Riot in Belgium: