About the only thing quirky with Namecoin is that you have to pre-order your name 12 blocks ahead of actually registering the name with data. This little delay makes for some quirks:
- If you have an IP idea now, you can't publish your proof until after ~2 hrs (unless you planned ahead).
Well, based on my experience, timing is not that much of an issue with IP.
Further, putting an IP signature in a blockchain should be considered just an additional benefit or security if a claim arose.
Something in the lines of 'I am the first to publish it and a proof can be found in TX XZY on the bitcoin blockchain', which of course does not automatically mean you really have the IP rights or ownership.
Especially in the 'music industry' proof of ownership and IP can be quite a tricky topic and a simple hash signature in a blockchain would not mean anything by itself.