I'm trying to research different ideas for starting a blog that I want to monetise and I'm unsure about when choosing a keyword or phrase to optimise on a blog/autoblog, should I be looking for one that is matched to a specific product or does this not matter? Lets just say I've got a blog about house music, and on this blog I have ads for Bose headphones or something, should I optimise my blog for the phrase 'house music' (the topic of the blog) or should I optimise it for 'headphones' or whatever the product is that is advertised on my site? I guess another way to put it is, should I start with a product in mind, then make a blog to suit it or should I start a blog and find products that would be relevant to that niche? Obviously the later would allow a broader choice of products to advertise, butthe question is, will the cnversion rate be as successful as a specific product? Obviouisly since I'm posting here I am trying to make money, not just make a blog.