I mentioned before about popstars and how much they did in anime including Avril Lavigne's shameless manga series or TATU's failed anime movie but in the cartoon world, it's a little more tricky. Most stars don't tend to enter the cartoon world apart from guest entries in The Simpsons or a show of equal value, as for cartoon pop shows, they are even rarer and judging by this subject, there's probably a good reason, so allow me to apologize for this one on behalf of the British Public, for this is the V-Birds.

The idea began as a promo in about five or six parts revealing more each time, it was about a group of girls sent to earth as punishment for refusing to dance for some event. They are sealed inside a dance machine and will forever spend their days dancing to the tunes of the kids who play said machine, see for yourself how bad this is, especially in animation terms.

The sad thing about this promo is the amount of faith that Cartoon Network UK had in the whole project, but the two major things they overlooked are so simple it's insulting.
1. The Pop Music Industry would never accept a virtual idol at the time who wasn't the Gorillaz. The simple fighting the juggernaut theory of failure.
2. The target audience were tweens who don't watch cartoons.
This wasn't just a failure by Cartoon Network, it was a high profile costly failure that pretty much killed off Cartoon Network's popularity for much of the 00s before Ben 10 came along to save them, although you American's probably experienced Cartoon Network's downfall differently. In this country we blame the V-Birds.
But there is a sense of what could've been, thanks to modern technology and people's interest, this youtuber cleaned up the music video for the bands only single.

It's much better to look at and with Hatsune Miku turning Virtual Idol into a much bigger industry, there is room for a comeback but you're going to need some retooling and better song writers.