What Heisenberg said is 100% true.
That being said, Indie labels technically could sue you the same way that the RIAA does, however, most of them are "anti-RIAA" and do not agree with the RIAA's approach. So I highly doubt they would even consider lawsuits to stop people from pirating their music. Many indie bands that I know of fully condone MP3s as a way to spread their music. They'd rather sell a CD then have someone download it for free, but they would rather have someone download it for free then not listen to it at all...