Roppongi Club

I'm planning to go to a Roppongi club with some friends for the first time, so have no idea what clubs are any good.
I really want to dance to some japanese music.

And I have heard a rumour about "ladies night" when womans can enter for free. But guess it is different for each club...
Anyway,would be grateful for any help.
Thanx on beforehand!

http://tokyoclubbers.com/clubs/?club_name=atom

If you're not into the western-style clubs, Atom seems to provide a less "semper fi" atmosphere and more for Japanese people.

I would generally keep out of Roppongi unless you are looking for Western style parties and for an area that is generally quite sleazy.
I'm not saying it's not fun - but that's just what it is.

You could try the new Lex Edo (http://www.newlex-edo.com/index2.html) - they have ladies night on monday and thursday.

For more Japanese style parties head to clubs in Shibuya.