That one instrumental of the pirate theme from the DLC case of Ace Attorney 5.
All things considered, that case was actually pretty cool. Shame it cost extra...
Also, as of this most recent edit: "Wonderful Boy" from Melty Blood: Act Cadenza. Been feeling rather down, so I thought listening to a "chill" theme would help, but it's actually making me more melancholic, as well as nostalgic... but I don't wanna get too negative here.