Popular Japanese songs?

Question:

I'm studying Japanese and I want to listen to songs in Japanese to help me with my listening skills. (was that a weird sentence?).

I'm hoping someone from Japan is awake and randomly decided to go on Y!A and sees my question.

But by any chance you would happen to know a website that has billboard japanese songs or recent japanese pop songs it would be greatly appreciated!!! :D

Answer:

what type of music do you like?these singer or bands are pretty popular in japan.

rokinon-kei
asian kung fu generation http://www.youtube.com/watch?v=jQ7MPdlc8…
radwimps http://www.youtube.com/watch?v=7MaF-bWeL…
one ok rock http://www.youtube.com/watch?v=xGbxsiBZG…
spitz http://www.youtube.com/watch?v=51CH3dPaW…
bump of chicken http://www.youtube.com/watch?v=F9L7QAL5m…

visual-kei
mucc http://www.youtube.com/watch?v=i9DmuDFDN…
SID http://www.youtube.com/watch?v=jbFsLgHkd…
Janne da arc http://www.youtube.com/watch?v=uW3snTVZS…
An Cafe /watch?v=cN9QYRkkwuY&feature=related

female singer
ootsuka ai /watch?v=eGHDrlvypWg
teshima aoi /watch?v=RUSjLyZpBPo
kawashima ai /watch?v=VeEAP44ToAA&feature=related
white berry /watch?v=vYuz7PcBb2U

female idols
AKB48 /watch?v=yNg3mcjhq9w
perfume /watch?v=UGP_hoQpLZQ
SPEED /watch?v=kPtIF2ckWvk

male singer
Yuzu /watch?v=0qOr9_YSoAM&feature=related
Ketsumeishi /watch?v=vnieKxden8U
Mr.Children /watch?v=i0_L1mkfinA
Hillclimb /watch?v=Sl-BDzmORX0&feature=relmfu
Orange range /watch?v=L6ZwdGPD1ec

male idols
i think ARASHI is most popular rignt now but I can not find any video.
Kat-tun /watch?v=nlnqatUy8BA&feature=related
w-inds /watch?v=ZAl4CObwiIQ

anime songs
k-on /watch?v=12aLC0azql4
bleach /watch?v=GpfqgWWCEUM
One Piece /watch?v=ay4Tpky7b7Y&feature=related
Neon Genesis Evangelion /watch?v=0kFhPVAhV_o