This is actually a new take on the soundtrack since the first season. Much more upbeat and somewhat epic. :)

KNIGHTS OF SIDONIA: Ninth Planetary Conflict THE ANIMATION ORIGINAL SOUNDTRACK
(MP3 320 CBR / Scans) (
Thread 192369)
Release date: 2015.06.24
Catalogue number: KICA-3244
Label: Starchild Records
Music by: Noriyuki Asakura
Tracklist:
01 Wakusei Nine (M02)
02 Heigus Ryuushi (M03)
03 Kyoufu e no Joshou (M07)
04 Sen'eki Nisshi (M09)
05 Morito no Unmei (M10)
06 Zoushoku Kakusan (M05)
07 Tenshi to Akuma (M24)
08 Yuugou Kotai Kyousoukyoku (M26)
09 Yochou (M28)
10 Yuugou Kotai Tsumugi (M27)
11 Daienkan Taikei (M15)
12 Senzai (M23)
13 Bousou (M25)
14 Yuudou Hishoutai (M04)
15 Semarikuru Kyoufu (M12)
16 Rensa Zoufuku (M13)
17 Hikari to Kage (M22)
18 Chuumu (M36)
19 Shuuchishin (M39)
20 Anji (M14)
21 Juuryokushi Houshasen Shashutsu Souchi (M16)
22 Tsugumorikai (M06)
23 Kyodai Gauna (M11)
24 Uchuu Sankei (M08)
25 Daishugafusen (M17)
26 Sidonia ~ Eien ni (M31)
27 Sidonia Romance ~ Dream Version (M20)