You are not the one who makes the decision how a creator of a work should distribute that work, unless YOU created that work. Take GPL-ed software. That's IP, if you want it or not. Why? Because that's what the law says.
If I take a GPL-ed piece of software and embed it in my proprietary piece of software and sell it, slashdot and the rest of the open source world would be up in arms, like they have been in the past. That's exactly the same thing as what this composer did.
I.o.w.: it's exactly the same as with the GPL: a work created by a person has distribution rights, and the owner of the work decides which ones, no-one else. Don't like it? Don't use the work. It's that simple. Same with GPL-ed software.
Furthermore, this isn't about some RIAA douchebag bullying some teen. This is about some composer who rightfully wants freeloaders to pay for his work, the same as what a software engineer who wrote a piece of GPL licensed code wants: s/he licensed it as gpl-ed code so users of it in other pieces of code have to follow the rules: it's not their code, they have to follow the rules what the OWNER of the code has stated.
The 'brenna' person is really not that bright. The claim that people can't afford expensive sheet music and really need it because they otherwise will never have a chance in the profession they've chosen is utterly lame. Not only does the composer show that the sheetmusic costs 4$ (which is on par with a starbucks latte in some cities) but what does this brenna person tell the cashier at the local grocery store? "Please give me this food for free, I can't otherwise make a living in this tough profession"? I don't think so.