If you're referring to the episode, "Privilege", then the song playing at the beginning was "Pride" by Syntax.
Yes he had several appearances the first of which occurring during the shows the second episode "the bad seed" (season 1 episode 2). Another popular episode featuring Orlando brown is "the after school special" season 2 episode 20
dancing on my own by Robyn
It wasn't Jesus that was playing Call of Duty it was the students while Mr. Mackey was trying to teach them how to use the computer. And that was during the episode "The Ungroundable" (Season 12 Episode 14)
Bonobo - If You Stayed Over
Grounds for Divorce by Elbow
The name of the song that is playing in that episode while Kimber is having surgery is Fat Bottom Girls. It is performed by Queen.
It was also featured on an episode of Beverley Hills 90210 in October of 1995, Season 6 episode 6 Speechless.
Werkin' Girls by Angel Haze
The sond it called "Chain" by a band named The Fire Theft.
Scissor Sisters - Take Your Mama
It's "You Don't Know," the 2006 Eminem song featuring 50 Cent, Lloyd Banks and Cashis.