Hello! i have a primary domain with approved adsense account.On my primary domain i have totaly legal content.but i want to start a mp3 search engine on a sub domain.But i am not going to place adsense on this sub domain. is it effect on my primary domain's adsense account??? please help me. Thank You!
Yes, it does effects your primary domain. Adsense looks sub-domain as part of a site. So, your adsense account can be risked.
if nobody complain, is ok, if some small fish complains, you still ok. BUT if some big music lable complain to google directly, you die