You all know that one background music with childrens voice singing choir in Gran Turismo 5 race menu before you start racing? I'm sure you know it if you play GT5. Read more if you want to hear it online and more.
The song is a remix by Breakbot from a song called Baby by PNAU. As much as I know, this song isn't included on the Official Gran Turismo 5 Original Game Soundtrack CD.
While the song is not always played on the before-race menu (The screen with Start Race, Race Option and Tuning), it randomly shuffled by one other song. Just one. So it's most unlikely you never heard of the song.
Disclaimer: I do not own or possess the media and any material provided above. I simply shares the links on my site and willing to drop it down on short notice.