School of Rock

The idea for the film School of Rock (2003) came about when writer Mike White moved into a flat next door to Jack Black. White would often find Jack Black running naked along the corridors or playing much of the music featured in the film at full blast.

When they are performing Zack's song for the first time, the drummer Freddy and the bass player Katie are in their stage outfits, but in the following cut they are back in their school uniforms.

-There is a fade to indicate time passing. They probably started practising and, once Dewey had worked out the parts, ran through the song again. You can also see the girls who provide backing vocals standing in the later shot, whereas they were seated initially.