I think that is actually the important question. Or at least, that and "In the UK is it 'Harry Potter and the half-blood prince' or 'Harry Potter and the Half-Blood Prince'?"
Artistic titles are usually title case, see: http://www.amazon.co.uk/Harry-Potter-Half-blood-Prince-Childrens/dp/0747581088
My eyes are drawn straight away to the words "playback" and "radio": these look out of place here (sloppy, even) without capitalisation.
That's exactly how they look to me. --gl
