Because the trend started by Levi Jeans to link a commercial with a memorable piece of music - in their case it was 'Heard It Through The Grapevine' has reached epedemic proportions! These days, a really catchy snatch of music herd two or three times sends a flurry of questions to the AB from people who want to know what the music is, and where they can find it. In response, the AB people have created a brand new 'Adverts' section for those Q & A's devoted to advert music.
Because people are thick and don't realise that theres an ad section. Personally I thought it was funny that someone posted a question about Jennifer Lopez in the Animals and Nature section.
Is she an animal?
Is she a plant?