I think Ezra's advice is roughly right. The easiest way to drum up an audience is to find a some topic, issue, or unfolding event, and make it your own. Your blog doesn't have to just be that, but it has to be the go-to place for that, and then you can fill it up with crappy music videos or whatever else makes you happy.
"Advice to bloggers" posts always seem to make some people mad. Do whatever you want with your blog! But in recent years that's how people who wanted an audience managed to obtain it.
