^ It's possible that the person on Clubdam created their own karaoke track. It's possible to do this if you have the original version by using some product like Audacity and (I think) reversing the phase of one of the tracks. Usually in a song the vocals are on both tracks and the instrumentation is split between the two tracks by reversing the phase of one track you can cause the vocals to completely cancel out.
http://ja.wikipedia.org/wiki/%E3%81%A8% ... F%E3%81%84 They never disbanded. Well, according to Japanese wikipedia... In 2009, they got a new website and all these new members (1 of them was a Up-Front Egg) joined the group. They weren't really a singing unit since they were focused on planting trees. Once the new members joined, they were in 4 separate teams.
You can go to their new(er) website to see the photos to see the "new" members. The group is pretty much inactive and the only remaining member is Kaneko Rie. http://www.uetai.net/
I may be wrong though. xD I rely on Jp wikipedia too much when it comes to H!P.