The 'Joker' soundtrack album features an original score by Emmy Award-winning composer Hildur Guðnadóttir (Chernobyl, Sicario: Day of the Soldado), whose composition features the cello as the centerpiece of the score, leading string-based melodies played by a symphony orchestra of 90 musicians.

Disc 1
1. Hoyt's Office - Various Performers
2. Defeated Clown - Various Performers
3. Following Sophie - Various Performers
4. Penny in the Hospital - Various Performers
5. Young Penny - Various Performers
6. Meeting Bruce Wayne - Various Performers
7. Hiding in the Fridge - Various Performers
8. A Bad Comedian - Various Performers
9. Arthur Comes to Sophie - Various Performers
10. Looking for Answers - Various Performers
11. Penny Taken to the Hospital - Various Performers
12. Subway - Various Performers
13. Bathroom Dance - Various Performers
14. Learning How to Act Normal - Various Performers
15. Confession - Various Performers
16. Escape from the Train - Various Performers
17. Call Me Joker - Various Performers