It would be nice if the songwriting team for “Crazy Ex-Girlfriend” could write songs in advance, but that’s not how it works.

Rachel Bloom, Jack Dolgen and Adam Schlesinger, the trio responsible for the show’s original songs, usually wait until the plot points of each script are figured out; it’s even better if scripts are nearing or in their final form before they begin their work. Once the themes, plot and dialogue are fairly locked down, they then expand on whatever dilemmas or problems a few key characters are going through.

Their efforts function “like a parallel writers room,” the show’s co-creator Aline Brosh McKenna said. “We can’t work backward from the genres, because the story has to dictate them.”

[ Read an interview with Rachel Bloom and Aline Brosh McKenna ]

Below, Bloom, the show’s co-creator and star; Dolgen, an executive producer and writer; and Schlesinger, the show’s executive music producer who is best known as part of the band Fountains of Wayne, highlight some of their favorites from Seasons 1-3.