I don't know if this is useful, but my Japanese friends listen to a lot of J-rock. Bands like Bump of Chicken, Nico Touches the Walls, Spyair, and Radwimps seem to be popular. Pop-rock or just in general pop is also really common.
My playlist is predominantly J-rock/pop, some indie some more well known. So bands like Sukima Switch, Super Beaver, nano.ripe, and my personal favorite, Ame no Parade.
But… there's a notable bias. You mention anime and promotional purposes, and I suppose I'll say this circle of friends is really into manga and anime. I get a lot of messages linking me to cover songs and occasionally vocaloids, which I can't really stand. So is this reflective of general trends? Probably not, because the bands I listed both mine and my friends have been featured in anime for opening and ending songs. Just note that how we found them wasn't necessarily from anime, and that one song from a show isn't representative of the band's work as a whole.
We're young and into anime, it's natural to pick up music from shows, but I'm sure they listen to more than just those bands. It's simply they bring up names that I've heard before from anime.
As for China, well what I can I say I kind of can't stand the Chinese music industry. It just does not work with my ears. I mostly heard pop, both old fashioned singers and modern bands. Not my thing. Didn't really recall any rock music during my month-long trip there last summer.
For my friends in the states, it's pretty diverse. One friend listens to rap, another almost entirely K-pop, another is in a band as a bass player, so he listens to heavier rock and metal. Of course this is a small number of while personality-wise diverse people, they don't reflect the rest of the community.