EDIT: For Avex artists, it's not a livestream per se. Rather, for 24 hours after the scheduled time, a youtube of the chosen tour is available for viewing.
Will edit this post for each stream.
Today/Tonight/Tomorrow Morning:
Livetune (5/4 @18:30) - 5:30AM EST, 2:30AM PST
https://www.youtube.com/user/kzlivetuneElectronic music. If Perfume were Vocaloids, and Nakata was an otaku, more conventional, and on picker-uppers.
Flumpool (5/4 @21:00) - 9=8:00AM EST, 5:00AM PST
https://www.youtube.com/user/flumpoolchannelRock. Can be used to exemplify what the J-rock sound is.
Hyadain (5/4 @22:00) - 9:00AM EST, 6:00AM PST
https://www.youtube.com/user/HyadainYTMWEVERYTHING. One of the greatest producers in Jpop, with a real gift for melody and flipping the bird to structure and genre boundaries. And sanity in music.
Hamasaki Ayumi (5/4 @23:00) - Not a livestream, will be released for 24 hours at 10:00AM EST, 7:00AM PST
https://www.youtube.com/user/ayuPop. In terms of her impact on the industry, Ayumi is Japan's Madonna. (Namie is Beyonce.) Notable for writing her own lyrics from nearly the beginning of her career.
Will be in chat from 18:00.
Every day of Music Week, Golden Bomber is also holding at stream at 10:00 JST (9:00PM EST, 6:00PM PST)
I won't be in chat for these, although I might drop in on the stream itself on a couple on the days the night stream overlaps with work.
https://www.youtube.com/user/zanyzapofficial