Music may perform better than books and other products, mainly because you can listen to the clips of an entire album in roughly 10 minutes and get a good enough feel for it without buying it to write a short review. If you have another topic that you're passionate about, great, but make sure you have a unique angle on the topic. People can get reviews about a lot of those consumer products anywhere. You need to give them a reason to visit your site.
There is no shortage of products you’ll be able to promote. You’ll have the ability to pick and choose products that you personally believe in, so make sure that your campaigns center around truly valuable products that consumers will enjoy. You’ll achieve an impressive conversion rate while simultaneously establishing the reliability of your personal brand.