"Will You Marry Me?" is a music track from Phoenix Wright: Ace Attorney - Spirit of Justice. It is only played once during a specific part of Turnabout Time Traveler, namely after Sorin Sprocket's proposal to Ellen Wyatt at the end of the latter's trial.
The uplifting track is played after Wyatt accepts his hand in marriage, and the judge conducts the end of the trial akin to a wedding ceremony with the couple together on the stand.
The track is a more upbeat version of Ellen Wyatt's theme song, "Ellen Wyatt - Walking Down the Aisle".