Ace Attorney: Apollo Justice

Featuring a novice defense lawyer's quest for justice, under the guidance of a familiar mentor, who is dead set on reforming that dreaded law system from the first trilogy.

Unused Music
This music an early variation of the "Guitar Serenade", a musical track that has vital importance to the plot, where the vocal chords are replaced with high piano notes. It also cuts abruptly in the end, hinting at its early unfinished nature. 

There are two unfinished tracks meant for a case introductory cutscene, here and here. A longer variation of these tracks was used for the prologue cutscene in the fourth case.

Demo Leftovers
Several images from the demo version can still be found in the final game.