Glorious new 'Crazy Ex-Girlfriend' intro is what this show is all about

In what is simultaneously the most exciting and saddest turn of events, Crazy Ex-Girlfriend is back on The CW right now for its final season. And on Friday, the fourth season's second episode introduced an all-new theme song.
For those who might be in the dark: Crazy Ex-Girlfriend is an underwatched masterpiece. It's a musical comedy — something we don't see too often on TV — that follows the exploits of a young lawyer named Rebecca Bunch. 
The story is a tough one to sum up. In