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Yes. The ring in the Kerosene music video was in another music video.
The Fergie video is most likely referring to the music video for the song "M.I.L.F. $" by Fergie.
Depending on which music video you're talking about...
There isn't a music video for You.
You can buy video game music in a number of different places. You can buy video game music from your local music store for example.