I'd love to see some RIAA enforcement types pulling over carloads of 6 or more thugs listening to their
rap at 120 decibels to check where they bought their "music". Really, I would.
Again, that’s private use. As long as the music is not used for public performance where commerce is taking place with the music as an enhancement, the administrators of royalties are not going to get involved. Even if you were occasionally to take the music to a public park and play it loudly amidst a larger population, it would be a long shot to see any repercussions legally. The RIAA governs an angle different from public performance, namely copy distribution. They undoubtedly had some say in limiting the amount of sharing with iTunes product. If you have an iTunes library, you do not own it. You’re renting it indefinitely.