...because musicians and bands seemed to have an affection for it, for whatever reason?
You mean distribution agencies have an affection for it. Myspace has been around forever, so it comes up high on Google, so the guys in charge of putting St. Vincent's music online maintain her Myspace account in addition to her Facebook, iTunes, etc. The artists themselves don't really care, they just want to be everywhere that ears and eyeballs are.
As far as this preview goes, it looks very much like Windows 8. You can tell there's people still just throwing money at the Myspace name, which surprises me. I thought it was pretty much a dead brand.