There are a lot of different resources I use to listen to japanese audio. One of them is streaming online stations. Here are a few I listen to.
This is my favorite station as it plays mostly anime soundtracks and that tends to be more of the Japanese music I like since I watch so much anime. This one is completely free, but they do wish for you to make a donation. I have a couple of times since I like it so much. I am a daily listener.
If i had to choose my second most listened to station it would be this one, but compared to Kawaii-radio not a whole lot. It is also very good, but i just prefer kawaii-radio. Definitely check it out for a while and see if you like it.
Japan A Radio:
This is another station I like they play a good variety and are a more full fledged actual radio station. It is “free”, but to get the most out of it I recommend paying for it.
If you like JRock then this station is for you. I don’t tune in a lot, maybe once a week. From what I have seen they have pretty much everything you need or would want, but then I am not a JRock expert at all.
Another JRock, all JRock, station I don’t listen to this one much, but thought I would mention it since it was referred to me by several other people.
Here are some others I know of, but have never actually listened to or looked at very much.
And finally here is a Japanese site with Radio Stations listed. Just click around the map at the top and find a station to listen to.
Updated: (these are radio stations added after the initial post)
91.8 The Fan
What are some radio stations you listen to, or how do you get your Japanese music?