Video & Mp3's (Weird Noise) Wheel Bearing? Rear Dif? Suspension? Brakes?

As I was coming home last night I had a little too much fun and decided to do some burnouts and have fun on a curvy road. I've done both of these things before no problem. Now the back driver side wheel is making this noise:

mp3_1
mp3_2
3g2 movie of car going in reverse very slowly.

While I was going in reverse, I was going down hill and had the brake on for part of the time. The low traction light came on when it made the noise (kind of odd).

I took the car up to 50, and the problem seems to subside, but occur again when I use the brakes/and or brakes made the noise come back.

We just replaced the seal on the rear differential last Saturday but I do not think its a drivetrain related problem because putting the car in neutral does not make the sound go away, but higher mph makes the sounds occur faster, I think it happens once every revolution.