This is the first time I've ever done this, but I'm going to attempt to imbed some videos into this post...
They're from the ladies that sung for the anime
rose - ANNA inspi' NANA(BLACK STONES) [official video]
Olivia inspi' Reira(trapnest) Nana - A Little Pain
Olivia Lufkin - Starless night
Here's a link to VIZ's Nana page... complete with products! (or, I'm pretty sure YOUTUBE has the live action and the anime...) http://www.viz.com/nana