I can't answer 1, since it depends on the changes made by this mod and the mod you want to stack it with. Aplos would have to tell you exactly what files he's modified.
However for question 2, song is "Comptine d'un autre été: L'après-midi" by Yann Tiersen.
http://www.youtube.com/watch?v=VFLF-gh4C2M
Most of the music is instrumentals from movies/famous classical music.
Battle Music
I recognize Brian Tyler's Decimation Proclamation
http://www.youtube.com/watch?v=YEhZN0BtbLk
The normal music
Summer '78 By Yann Tiersen
http://www.youtube.com/watch?v=nfwWKCRth_A
Lara's Castle By Yann Tiersen
http://www.youtube.com/watch?v=jXtoXEcPumE
Moon flower by japanese composer Kitaro
http://www.youtube.com/watch?v=u5YYvVSldrc
Itzhak Perlman (The theme for Schindler's List) by John Williams
http://www.youtube.com/watch?v=XLK5OWU2YGw
The Main Theme From Band of Brothers by Michael Kamen
http://www.youtube.com/watch?v=F9LthlHgzV0
Requiem- From Band Of Brothers Soundtrack
http://www.youtube.com/watch?v=pAfhaEoL4hY
Song from a Secret Garden
http://www.youtube.com/watch?v=wasYNNfnfVE
The Promise- Secret Garden
http://www.youtube.com/watch?v=sqxbZq7d86Q
Parts of Concerto for Violin and String Orchestra by Vivaldi
Parts of Ave Maria by Johann Bach
Also some music from various Star Trek Movies
Recognize one from the Wrath of Khan
Also a track from the Gladiator (the movie) soundtrack, can't remember name though.
Surprised there isn't any Hans Zimmer in there. Hans Zimemr is represented by the Gladiator music, oops
Guess that just leaves out ES Posthumus from major instrumental composers for movies, though their music is kind outta place with the rest.