| ID | Interpret | Skladba | Album | |
| 1. | Marc Power and Dirk Bruere | One Tribe - Darwin was an optimist | Resonance FM Podcast |  |
| 2. | Dr. George Johnson, Washington University | Darwin Day: Darwin confronts intelligent design | Ethical Society of St. Louis | |
| 3. | Dr. George Johnson, Washington University | Darwin Day: Darwin confronts intelligent design | Ethical Society of St. Louis | |
| 4. | Matthew Chapman | Guest: Matthew Chapman, Author, Filmmaker & Darwin's Great-great Grandson & Updates on FFRF's "Praise Darwin" Billboard | Freethought Radio | |
| 5. | Thomas Easaw, The Deepest Living Voice on Earth | The Optimist | Don't Start the Last World War | |
| 6. | Die ?rzte | Der Optimist | Bern 14.07.2001 | |
| 7. | Die �rzte | Der Optimist | 15 Jahre Netto CD1 | |
| 8. | It Pays To Be Ignorant | What is an Optimist | 08/18/44, episode 98 | |
| 9. | New Young Pony Club | The Optimist | The Optimist |   |
| 10. | Die �rzte | Der Optimist | Bern 14.07.2001 | |
| 11. | Emma Pollock | The Optimist | Watch the Fireworks | |
| 12. | Emma Pollock | The Optimist | Watch the Fireworks | |
| 13. | HIGH CONTRAST | Eternal Optimist | Tread Softly | |
| 14. | Casper & The Cookies | The Optimist's Credo | Lee's Palace, Toronto - 20 Feb 2007 | |
| 15. | Casper And The Cookies | The Optimist's Credo | 2/3/07 Caledonia Lounge - Athens, GA | |
| 16. | Casper & The Cookies | The Optimist's Credo | Lee's Palace, Toronto - 20 Feb 2007 | |
| 17. | Casiotone for the Painfully Alone | Optimist vs. The Silent Alarm | Vs. Children | |
| 18. | Casiotone For the Painfully Alone | Optimist Vs. The Silent Alarm | Vs. Children | |
| 19. | Casiotone for the Painfully Alone | Optimist vs. The Silent Alarm | Vs. Children | |
| 20. | Casiotone for the Painfully Alone | Optimist VS The Silent Alarm | VS Children | |
| 21. | Casiotone for the Painfully Alone | Optimist vs. the Silent Alarm | 2009-06-30 - 529 Bar, Atlanta, GA | |
| 22. | Casiotone for the Painfully Alone | Optimist vs. The Silent Alarm | Vs. Children | |
| 23. | Casiotone for the Painfully Alone | Optimist vs. The Silent Alarm | Vs. Children | |
| 24. | English Teacher John | ETJ Show 14: optimist, pessimist; keep in mind | English Teacher John Show | |
| 25. | Barry Gray | The Tribe | Space 1999 Year One - Disc 2 | |
| 26. | Sick Man of Asia | The Tribe | Sick Man of Asia Presents | |
| 27. | Chris Cefalu | Tribe | | |
| 28. | Luka Bloom | Tribe | Tribe | |
| 29. | Dave | Tribe Mix | deeznotes.com | |
| 30. | Chris Cefalu | Tribe | | |
