I maybe wrong....
But i'm sure it started as just a social network blog. then they added the myspace music blog later on, and now that's what it's mainly used for.
( ,
Sat 5 Jan 2013, 16:30,
archived)
That's more or less what it is now, but most people are buggering off to Soundcloud, Bandcamp, etc.
( ,
Sat 5 Jan 2013, 16:37,
archived)