My target audience

On the left, I have posted a table of what different social grades mean. This is so I can decide on which social class I want my magazine to appeal to.
I want my target audience to be people around my age, but for both genders, across the majority of the social classes and for any ethnicity. I'm planning on creating the music magazine not based on one paticular music genre, this is because I'm hoping that a variety of people will want to read my product.