So, after spending a whole lot of time on the J-Wave sites, I've determined the following:
1. J-Wave does not have a live internet stream
2. The podcasts are not going to be any help (try downloading one of them).
3. Parc was played at 11:55 and 19:31 on 5/7, and at 8:42 on 5/8.
4. Parc is about 7-8 minutes long.
5. It most likely will be played a few more times over the next few days.
6. I would really like to hear Parc.
Unfortunately, it looks like the only way we'll hear it is if someone in Tokyo records the radio for 24 hours, and extracts it based on the song list.
Today's songlist:
http://www.j-wave.co.jp/songlist/pc.html
Yesterday's songlist:
http://www.j-wave.co.jp/songlist/pc_y.html