Vespertine,
The straightest and easiest answer relates to their formats.
Rock of Ages is a more traditional (only by comparison with Power Balladz (edit: by this I mean it's still a musical with scenes and acts, but it eschews the fourth wall many times, unlike most musicals)) musical with a large ensemble cast and a few storylines going from point A to point B with some of the greatest music of the glam rock era ushering it along.
Power Balladz is a barebones production with 3 actors and 5 musicians on a stage in what is closer to a rock concert with brief lectures/jokes in between songs.
The music used has a fair amount of overlap, but what each song represents to each play is entirely different. For example, Rock of Ages has a character named "Christian" which is where the Night Ranger song "Sister Christian" gets tied in. With Power Balladz "Sister Christian" is included not as a plotpoint but as a musical example of the power ballad artform.
It's a question of style and substance. Each has different intentions for both.
Updated On: 8/20/10 at 03:38 PM