Later today (7:30 PM US East Coast, 8:30 AM Japan time. Go here to check what time it is for your country), Morning Musume, S/mileage, and Buono! will all make some sort of appearance on J-MELO for their idol special (idol specials are awesome aren't they?).
You can watch live here: http://www3.nhk.or.jp/nhkworld/r/movie/
If you miss it, it replays a couple of times (check the schedule in the first link) and also I'll probably be recording it.