Crazy Ex-Girlfriend Genre Romantic comedy Black comedy Satire Comedy-drama Musical Created by Rachel Bloom Aline Brosh McKenna Starring Rachel Bloom Vincent Rodriguez III Santino Fontana Donna Lynne Champlin Pete Gardner Vella Lovell Gabrielle Ruiz Opening theme "Crazy Ex-Girlfriend" performed by Rachel Bloom (season 1) "I'm Just a Girl in Love" performed by Rachel Bloom (season 2) Ending theme "Crazy Ex-Girlfriend" (instrumental, season 1) "I'm Just a Girl in Love" (instrumental, season 2) Composer(s) Adam Schlesinger Jerome Kurtenbach (pilot only) Country of origin United States Original language(s) English No. of seasons 2 No. of episodes 25 (list of episodes) Production Executive producer(s) Aline Brosh McKenna Rachel Bloom Marc Webb Erin Ehrlich Producer(s) Sarah Caplan Rachel Specter Audrey Wauchope Location(s) Los Angeles, California West Covina, California Camera setup Single-camera Running time 40–43 minutes Production company(s) LeanMachine webbterfuge (season 1) Black Lamb (season 2) racheldoesstuff (season 2) Warner Bros. Television CBS Television Studios Distributor CBS Television Distribution Release Original network The CW Original release October 12, 2015 (2015-10-12) – present External links Website