I really liked the background song used when UB-02 Absorption came along, so I just edited my own mix to listen to later.
Idea basically came from https://www.youtube.com/watch?v=GB15qcW3KbA
To be more precise, the songs used in order are as follows.
The Darkness - The End of the Line
Advent Children - One Winged Angel
Starcraft - Zerg 4
Please contact me if you would like to use this in a project. We can discuss the details.
* Cover / remake of a third-party piece.
Excercise caution when using it, refer to author comments / contact the author for details.