Blogging when you don't have much to say

I have a wide range of interests. The problem is, with each one, I can't really imagine myself blogging about it long term. Either I don't know that much about the topic and I'm not particularly keen on learning a great deal more about it (in other words I like to keep it as a casual interest), or, if I do know quite a bit about the topic, I'm just not interested in writing about it.

For example, I'm a musician. I play guitar. I've been working on a short ebook about a particular aspect of guitar playing (fretboard familiarization using greek modes, for anyone who knows what I mean). Writing the book isn't a problem, the problem is that I seriously can't be bothered to blog endlessly about that aspect of guitar playing (never mind the fact that before long I would have covered everything in the book), or even about guitar playing in general.

The thing is, sometimes a person can be quite interested in something, or even very interested, but their outlet for their interest doesn't include writing. I mean, I can enjoy playing guitar, but seriously I can't be bothered to write about it long term. The only reason I'm interested in writing a book at all is because I think I've come up with quite a nifty system, which I do enjoy defining, clarifying, etc. But apart from that, the only thing I like doing is playing, not writing.

The great irony is that I do love writing, and I'm quite good at it. I'm actually very keen on finding a good reason to write. But there's a mismatch between my love of writing and my distaste for writing fluff and repeating myself, which is what I'd end up doing if I started a blog based on my product (that's if I finish it). I'm also not keen on having to rehash other people's articles just to have something to write. I just don't want to force myself to write. I don't want it to be a constant struggle.

I do realise that if I'm going to create an information product (ie a book about guitar fretboard familiarization), I'm going to need a blog, so that I have a reason to keep adding to it, so that I have a marketing tool.

But as I say my interest is limited to doing it, not writing endlessly about it. I wouldn't mind maybe writing about 3 or 4 articles, and then leaving it at that, but I know that's not the way to do it. I'm stuck.

Basically I've racked my brains and out of all the things that I'm interested in, not one of them is something that I feel enthusiastic in blogging about long term. I'm more interested in creating info products (including the writing aspect of that). But also, I do want to write in a blog. At first I hated the idea of marketing, but now that I get it, I'm ok with it, and I definitely do feel that a good blog to accompany my products would be the way to go.

Another issue is that I don't feel that I could create multiple information products about any of the topics that I'm interested in. For example, with the guitar book, I think I might be able to come up with maybe 2 or 3 more short books about other aspects of guitar playing, but after that, that would be it. Same goes for my other interests. Basically I have an eclectic mix of interests, and my enthusiasm and passion is spread over all of them, rather than being concentrated intensely on any one of them. The exception is guitar playing, but when it comes to writing about it, I only have so much that I'm able to and willing to write.

This is something that I've looked into but out of all the business / entrepreneur / blogging blogs that I've seen, none of them seems to really address this in a helpful way. All I see is the same generic advice.

What should I do?