drafting and planning - target audience

for my music magazine i hoping to base my genre of electo music so i will have to aim for a particular audience. as most music genres have a broad range of i wont bel looking for a particular age demographic but i am aware that small children and the elderly wont be choosing to view this product so i wont be considering them when i make my decisions. also i know the people viewing my magaine will show an intrst in my genre of music so i have to base my decisions on my genre because i dont want to create confusion for example using a choir as a band.