I love to listen to J-Rock/J-Pop music. My absolute favorite Japanes band of all time is GLAY. They're so cool!
I have tons of anime CDs because after I watch a certain series, I quickly go online and buy the soundtracks, singles, etc. I've got the Cowboy Bebop soundtracks, I have some Final Fantasy soundtracks, Shenmue, Fushigi Yuugi, Rurouni Kenshin.....and a lot more. The J-Rock/J-Pop bands I like are: GLAY, Aucifer, Smap, Judy and Mary, m-flo, Hana Hana, Sophia, Eden....and a couple others, I can't remember. But, I mostly listen to anime music and GLAY.