as of 4.0 and lower the music should go on /MUSIC or /music in any external USB device, and I think internal too...sorry, tired.
"I am currently working on adding xmb music playback, it'll be in the next release."
bgm.mp3 is the default background song, well I have it setup to just that, you can replace it with whatever you want.
And about switching views...well, its on a timer now, but if requested then i will add it as an option or a keypress.
and I like that you asked questions... that's why I made it, and they sometimes becomes an ideas that can be added.
added more to mp3 list, looking real hot...can't wait to be done and release it...lol
and I was supposed to take a break after 4.0...yeah right.