The Crazy Ex-Girlfriend Theme Song is used for the opening of the show during Season One, which explains its premise. It features Rebecca Bunch singing alongside cartoon versions of the other main season 1 characters and her getting angry at being referred to as crazy by them. In several episodes the musical number is set up by a character questioning Rebecca's origin. Its first appearance was in the Season One episode "Josh's Girlfriend is Really Cool!". This was also done as a meta reprisal done later in the season by Scott and Paula Proctor. The song is track number 1 on the Crazy Ex-Girlfriend: Original Television Soundtrack (Season 1 - Vol.1).
The song with lyrics
Stoopid Buddy Stoodios
|The animation for the opening theme was done by Stoopid Buddy Stoodios founded by actor Seth Green. "Crazy Ex-Girlfriend" star and co-creator Rachel Bloom had previously worked on Stoopid Buddy Stoodios Cartoon Network show "Robot Chicken". She was a staff writer and also provided voices on the animated series.
Voice of the Sun
An instrumental version of the "Crazy Ex-Girlfriend" theme song plays out over the ending credits.