The Obi-Wan Kenobi trailer features two of Star Wars' most iconic scores, both of which carry heavy meaning for the titular Jedi Master. Coming from longtime Star Wars composer John Williams, these two scores from the prequel trilogy have been blended together as Obi-Wan prepares to go on a new adventure he likely wasn't prepared for. As such, the use of these two epic dueling scores helps confirm that Obi-Wan will become a Jedi once more while also facing his own tragic past.
The two scores used in the Obi-Wan Kenobi trailer are "Duel of the Fates" and "Battle of the Heroes", both of which featured Kenobi gripped in epic lightsaber duels that had tragic consequences. "Duel of the Fates" was composed by Williams for Star Wars: Episode I - The Phantom Menace, featuring Kenobi as a Padawan who joined his master Qui-Gon Jinn in a duel against Darth Maul during the Battle of Naboo. Likewise, "Battle of Heroes" was composed for the final lightsaber duel of the prequel trilogy seen in Star Wars: Episode III - Revenge of the Sith where Obi-Wan had no choice but to face his fallen apprentice Anakin Skywalker on the lava-covered world of Mustafar.
Now, both scores have been combined for the new Obi-Wan Kenobi trailer, providing intensely epic music as viewers are given their first look at Obi-Wan's time on Tatooine (and beyond). However, the scores represent so much more than simply building up hype for Star Wars fans. Both scores were played during the most tragic and tumultuous times in Obi-Wan's life. "Duel of the Fates" represents the duel where he lost his master, which motivated him to train Anakin as the Chosen One, while "Battle of the Heroes" saw Kenobi losing Anakin to the dark side of the Force several years later. As such, the use of both scores in the trailer indicates that Obi-Wan will be igniting his lightsaber once more, with potential for even more tragedy. In both instances in the prequel trilogy, Obi-Wan put aside his feelings and forged ahead, adhering to the Jedi Code; it's plausible something will happen that will force him to make the same choice in his TV show, because fundamentally, Obi-Wan is a Jedi — it's as the Grand Inquisitor says, it's an itch, he can't help it.
Seeing as how the new trailer for Obi-Wan Kenobi features Darth Vader's Jedi-hunting Inquisitors closing in and present on Tatooine itself, it's clear that dark days are ahead for the Jedi master. Combined with past confirmations that Vader himself will appear in the series to lock lightsabers with his old master once more, there's no doubt that Obi-Wan will be facing a gauntlet of dangers in his new series. As a result, the use of the past Star Wars scores in the trailer certainly feels earned beyond just building hype via nostalgia.
It should be noted that John Williams will return to compose the theme song for Obi-Wan Kenobi, which is fitting considering Obi-Wan is yet another legacy character, thus falling in line with him scoring the theme for Solo: A Star Wars Story in 2018. While he could very well compose a brand new score for Darth Vader and Obi-Wan's upcoming rematch as well, there would certainly be some emotional resonance and poetic symmetry if both "Duel of the Fates" and "Battle of the Heroes" were blended by Williams himself for the new Star Wars series (rather than just being used for Obi-Wan Kenobi's trailer.
