LAF. So, was continuing my meandering through Ishkur's guide to Electronic Music, which has quite funny descriptions of all the genres that may or may not exist. It also has nice samples which illustrate the genres very well. They're good to listen to while I do mindless work.
And guess what? There's a jpop listing! It's quite an entertaining one too. There's a sample from Hamasaki Ayumi (of course), and Megumi Hayashibara.]
To find jpop, you can click on the "House" button, and it's on the far right.
For other funny entries, you should check out the section on German under "trance". LAF.