I'm no expert on such matters but have a few thoughts. Tim is probably the best one to answer and can correct me if I'm wrong.
I think moving to wp.org would be a real good idea. You will have more flexibility to tweak and customize your layout. Plus, I think self-hosting is the right way to go these days. Not sure how you host your mp3's? Wp.com is free so hosting on your own domain would require extra money but would probably be worth it. Plus, the current main url you have is somewhat awkward with the .wordpress.com at the end.
You have everything redirected now which is good. But having apocketfullofseeds.com as your main domain would (imo) be more powerful for SEO and other things. The .com is still the best.
Overall, moving to wp.org would give you more options and flexibility than wp.com. Plus, wp.com is more susceptible to having the Google Blogocide issue. Being self hosted doesn't take that issue away but minimizes things somewhat especially if you also host your mp3's elsewhere. I had Site5 in the past which was quite expensive. And I also hosted my mp3's there. However, whenever a DMCA takedown notice was sent, it went to Site5. They then politely emailed me about the "infringing" content and gave me 24 hours to remove it which I did. No problems, from them. at least regarding shutting my site down. However, I cannot speak for other hosting services on that matter.
Regarding the wp.com to wp.org - I've never done it but am sure it's possible and probably fairly effortless. If memory serves, there should be a thread somewhere here that Tim wrote regarding doing that. Or maybe that was for blogspot to wp. Not sure.
Anyways that's my two quid worth, hopefully helpful rather than not.


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