A weblog makes sense to me.

The only thing a weblog lacks is an “index” so that a release can look album-ish. But in personal weblogs, one works around this in a hundred ways, and I’d have to think one could invent a weblog style that permits one to have one’s cake and eat it, too; i.e., be a simple weblog but also have a way to see releases of songs in a songlist/album format.