- I Could If I Wanted ToWritten by Jack DolgenProduced by Adam Schlesinger & Steven M. GoldPerformed by Santino Fontana[Greg sings the song after class]
- Clean Up on Aisle 4Written by Rachel Specter & Adam SchlesingerProduced by Adam Schlesinger & Steven M. GoldPerformed by Hunter Stiebel[Marty serenades Ally in the supermarket]
- Heavy BoobsProduced by Adam Schlesinger & Steven M. GoldPerformed by Rachel Bloom[Rebecca sings the song after trying on the wedding dress]
- Crazy Ex-Girlfriend(uncredited)Written by Rachel Bloom & Adam SchlesingerPerformed by Rachel Bloom and chorus[Series theme song played over the opening title sequence]
- We Have Friends(uncredited)Performed by Benjamin Siemon[The grocery clerk with half an eyelid sings his line of the song when he is introduced]
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