For your chosen Sub-Genre (Rock, Dance, Pop etc) create a Target Audience Profile.

Most people who buy HAMMER tend to be men aged between 15 and 25. Most tend to be of western ethnicity and range in social class, income and location. Most would have tattoos, dyed, long hair and would work in retail, volenteering or a creative work of line. They would steryotypically wear black, band tops and chains. They would probably go to a lot of gigs and concerts and live life to the fullest in their own way, in a way they see fit. 

10 things that make a metal magazine

1. Controversial picture
2. Edgy and graphic masthead
3. Dark house style
4. Dark background
5. Lots of info about gigs
6. Violent pictures & suggestions
7. Religious puns
8. One/two people from the band on the cover at anyone time
9. High contrast/ Monotone colour scheme
10. Lots of props