One name: Dane Cook. Yeah, I know he's a comedian and not a musician, but he made his career on Myspace. You can have all the talent in the world but if you don't catch the exposure, you make the odds against achieving monstorous success that much greater.
When there's such a powerful marketing tool available to you, I say jump on it.
[FONT=Tahoma]"All I can do is be me ... whoever that is". Bob Dylan [/FONT]