Has anyone heard of Tsukiuta?

I know that Vocaloids are pretty popular, though i never really got into them myself. This year there was a collaboration between Vocaloid producers and popular Seiyuus (voice actors) to release monthly songs.

December to May had both Male and Female characters and discs released
June to November only had Male releases

I thought it was pretty cool when I first heard about it when the first six had been announced. They even gave group names to the two sets of guys, the first set called Six Gravity and the second set called Procellarum.

I love the some of the Seiyuus they've chosen, and the songs themselves are really nice to listen to, since they correspond with the month they are released, a bit of festive music in a way? I kind of do wish they'd finish the months for the girls to though, it feels like the female Tsukiuta aren't getting as much attention as the males.

They even have duet cds planned for the New Year already.

I think it's a pretty cool concept though, I look forward to the new songs that will be released with the new year~