Yes, I do listen to J-pop, but not a lot of J-rock. However, I don't listen to them as much that I would know the names of the artists. Most of it comes from Anime or Manga shows...music is pretty nice.
Also, I listen to a lot other pop and rock music genras...I have special liking to one that my dear creates. His music compositions are simply superb...playing electric guitar is kinda like a second nature to him.