if you can find it: 'Sincerely' byTsutchie on YouTube; it's a Samurai Champloo ost remix.
'Sincerely' has that signature "Champloo" feel, but, in my opinion, this has a more . . . I don't really want to say virgin feel (on this site), but at the same time I don't want to say simple either, making it seem like a lesser version, or made of lesser stuff. Pure is the wrong word too because it is very original, as well.