The 13th Anthology

The 13th Anthology is one of four Kingdom Hearts tracks in the album Drammatica, a compilation of Yoko Shimomura's musical pieces from her works in various Square Enix games, including Kingdom Hearts. The other three are Twinkle Twinkle Holidays, Destati, and The Other Promise.

Essentially it is a compiled orchestration of the major pieces that represent Organization XIII throughout the series. The score includes noticable elements from: What is common about these pieces is that they all share at least a piece of the melody of Another Side and thus are included.
 * Another Side; used in the Kingdom Hearts Final Mix secret movie Deep Dive, which introduces Organization XIII. The first piece then reprises as the last piece at 6:10.
 * Organization XIII; theme music of the Organization in Kingdom Hearts II. Based on the first portion of Another Side
 * The 13th Struggle; The boss theme of all Organization members in Chain of Memories, except for Marluxia, repeated for Axel and Luxord in Kingdom Hearts II. Plays at 1:01.
 * The 13th Reflection; boss theme of the five Absent Silhouettes in Kingdom Hearts II Final Mix+. Plays at 2:10.
 * Graceful Assassin; the boss theme of Marluxia's first form in Chain of Memories and Re:Chain of Memories. Highly based off and similar to, but not to be confused with, Another Side. Plays at 2:51.
 * The 13th Dilemma; boss theme of Demyx at Hollow Bastion, Xaldin, Xigbar, and Saix. Based on the faster portion of Another Side. Plays at 3:15 following the pause after Graceful Assassin.
 * Lord of the Castle; boss theme of Marluxia's third and final form, exclusive to Re:Chain of Memories. Plays at 4:06.

Conversely, these Organization XIII related tracks were not used due to lacking any portion originating from Another Side. These are:
 * Disappeared; boss theme against Unknown in Kingdom Hearts Final Mix, repeated for his true identity Xemnas in Kingdom Hearts II.
 * The 13th Floor; Theme of Castle Oblivion
 * Thirteenth Discretion; theme of the Organization in Chain of Memories.
 * Castle Oblivion; theme of the Castle Oblivion level in Chain of Memories.
 * Tension Rising; battle theme of most story-related Nobody battles, including the Twilight Thorn.
 * Sacred Moon; theme of The World That Never Was
 * A Fight to the Death; first final boss theme of Kingdom Hearts II.
 * Darkness of the Unknown; second final boss theme of Kingdom Hearts II.
 * Destati; though not an Organization song, the third tier of Darkness of the Unknown begins with Destati and is meant to represent Xehanort, Xemnas' original self.