I guess it depends how you define “successful blogging”. I assume you mean super popularity, Scoble-grade interaction, the echo chamber, etc.

I think on a musician site the blog isn’t the #1 priority, the music is, so by its very nature it’s got that working against it.

I was a lot bloggier in the past, pointing to any neat stuff I came across, but I felt most people were coming for news about Brad Sucks related stuff and have gotten a bit more insular as a result.