Hmmm, a bit of a weird post, but here goes:
J-pop is mainstream popular music from Japan. Kanto-pop (or Canto-pop) is popular music from Hong Kong (it's sung in Cantonese)
You mean to tell me that you're downloading music directly to an MP3 player instead of to your computer? You've lost me there, but I suggest peer-to-peer programs like Kazaa, WinMX and Audiogalaxy to get MP3s
I hope this helps