what is you favorite song in japanese?
I realized that the best method for me to learn another language is by listening. I learned english by listening song and watching tv. So now i want to learn how to speak japanese by listening to songs and watching Japanese dramas.

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Tears by X Japan and 花は桜君が美し　Ｂｙ　いきものがかり

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Hi, Diana! You've changed your name! I sometimes see the name as yours in japan too!

I really agree with you. Learning by listening song is the one of the great and enjoyable way.
Speaking of your question, I don't know music genres...but I like something energetic, cute and make me happy.
So if you like these kids of songs...I'd recommend you Satomi' .  She's really cute and has a beautiful voice.
Check this out!  http://www.youtube.com/watch?v=dTmQDh0VXQI

and I also recommend, Fukuhara Miho, she is really famous in japan.
http://www.youtube.com/watch?v=DjeO_6Wv_ME
I'd heard she has sung at a gospel church in us or somewhere not japan. She has a really strong voice! Amazing!

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Quite a lot of Miyavi's songs.  I love him, and his attitude.  And he changes quite a lot, so if you don't like one song, chances are you may like a different one.  

I guess it would depend on what kind of English music you like though, for me to help you find Japanese music you like.