Re: Music in the Dojo?
I've experimented with using a soundtrack to establish, mostly, a rhythm to practice. Used shakuhachi, koto and taiko mainly, but also injected some less trad. more rad stuff, too. The thing I found most useful on the mat wasn't music at all, though. It was an environmental audio CD of a seashore, waves breaking and all that.
After a while, I abandoned the soundtrack idea entirely, as being too much of a distractor.
In some (though, not many) dojo, I've seen (mainly for special events) taiko drumming being used to call class to order or to establish transitions between classes and so forth.