I don't think there's such thing as a voice of rebellion, or at least not practically speaking. How can the voice of 'the rebellion' transfer from the oppressed to the oppressor without using the language, the mannerisms, the medium, etc that the oppressor uses? It can't. To truly be understood, the oppressed must become uniform with the oppressor to communicate his/her oppression. In doing so, the oppressed becomes (at best) alien to both the dynamic nature of the rebellion itself (because he/she is now akin to the oppressor) and the figure of oppression (because he/she is telling the oppressor where to stick it).
If you leave this hypothetical oppressed/oppressor dynamic behind and just talk about conformity, it's impossible to escape. You can conform to the majority trend, or you can conform to the counter-trend, or you can conform to the counter-trend of the counter-trend, ad nauseum.
Realising this, as long as you're happy and like the music you're listening to, and the messages you're hearing, then who the hell cares what you're listening to because everyone else can shove it. Without making an absurd hyperbole, the names of the people with truly unique ideas throughout our history can probably fit on an 8.5x11 sheet of paper, but that doesn't mean that there haven't been intelligent, capable, visionary people. So what if most of the majority are, and always have been, complacent and dim? The world isn't turned on the whims of the general body of conformers, but by the exceptional particular individuals -- it just seems to me that we try to pass off our 'rock and roll' stars as these visionaries, when in truth none of them have any groundbreaking contributions to make and are in no way exceptional.