http://www.slate.com/articles/arts/television/2015/06/tv_credits_sequences_from_beverly_hillbillies_to_unbreakable_kimmy_schmidt.html

I’m not a superhero. I don’t technically have any superpowers, but I come pretty close in my ability to remember TV theme tunes. I can whistle the melodies of shows I haven’t seen in decades, and identify them by the briefest glimpse at the credits. None are embedded quite as deeply in my noggin, though, as the programs that explain their premise in an opening sequence, often with the help of a catchy ditty. Strangely, in an era when title credits are shrinking into nothingness, backstory-explicating openers are making a comeback.