In the episode, the kids start a rock band, but concerned with the fact that people will potentially download their music from the Internet illegally, they refuse to play.
The episode satirizes famous artists who have spoken out against copyright infringement, such as Metallica, and also serves as a commentary on how most musicians do what they do mainly for profit gains.
Stan Marsh, Kyle Broflovski, Kenny McCormick and Eric Cartman form a band called Moop, but disagree on what direction they should take, as they all like different types of music.
They are immediately arrested by the FBI and are told of the serious consequences of illegal downloading, namely forcing musicians like Lars Ulrich (drummer of metal band Metallica), Britney Spears, and Master P to lose so much income from music piracy that they must either downgrade their extremely lavish purchases to very-slightly less lavish ones or save up until they can afford all of what they want.
As a result, Moop decides to go on strike until fans stop downloading illegally and are joined by a large number of musicians, including Britney Spears, Ozzy Osbourne, Missy Elliott, Master P, Blink-182, Metallica, Alanis Morissette, Meat Loaf, Rancid, and even Skyler's band, the Lords of the Underworld.
Cartman builds the band's repertoire by simply taking vague, generic pop love ballads and changing references like "baby" to "Jesus".
"Christian Rock hard", along with the fourteen other episodes from The complete seventh Season, was released on a three-disc DVD-set in the United States on March 21, 2006.