Briefly outline your target audience

As my magazine will have an emphasis on classic rock, it will mostly contain musicians who were around in the 60's-80's. This is quite a niche audience, and most of the audience for my magazine will be people who were around when some of these bands first formed, growing up listening to them. Because of this, the main demographic for my magazine will be the 35-55 demographic.
However, not all of the audience for the magazine will be this age. The audience will also include younger readers who started listening to the genre later than those in the 35-55 demographic, including some who have only become interested in the genre recently. Some of my audience will be in the 24-35 demographic.

The genre the magazine will focus on is not generally a "high" kind of music like classical, which is mostly listened to people in higher classes and demographics. The genre is open to people of all demogrpahics, but is mostly listened to by working-class to middle-class people, mostly male adults.

For these reasons, I think the main SEG demographics for the magazine will be the C2 and D demographics.