These are combined mixes for each zone and boss in Shadow Generations with remastered and normalized sound for more pleasant listening experience.
All the songs are taken from the in-game music files.

Shadow Generations Remastered Mixes

Remastered combined Act 1-2 mix from the 1st stage Space Colony Ark.
Sound has been normalized and Act 2 tempo is adjusted to Act 1 (160 BPM).

Arranged by Jun Senoue, TeddyLoid and Circuit Freq
Based on "Final Rush" from Sonic Adventure 2 by Jun Senoue

Shadow Generations - Space Colony Ark (Act 1+2 Mix)

Remastered combined Act 1-2 mix from the 2nd stage Rail Canyon.
Sound has been normalized and Act 2 tempo is adjusted to Act 1 (158 BPM).

Arranged by Sonic Adventure Music Experience and R.B.U.
Based on "Rail Canyon" and "Bullet Station" from Sonic Heroes by Jun Senoue

Shadow Generations - Rail Canyon (Act 1+2 Mix)

Remastered combined Act 1-2 mix from the 3rd stage Kingdom Valley.
Sound has been normalized and Act 2 tempo is adjusted to Act 1 (170 BPM).

Arranged by Audissi Studios and Yuzuru Jinma
Based on "Kingdom Valley" from Sonic the Hedgehog 06 by Mariko Nanba

Shadow Generations - Kingdom Valley (Act 1+2 Mix)

Remastered combined Act 1-2 mix from the 4th stage Sunset Heights.
Sound has been normalized and Act 2 tempo is adjusted to Act 1 (185 BPM).

Arranged by Sonic Adventure Music Experience and TORIENA
Based on "Sunset Heights" from Sonic Forces by Tomoya Ohtani

Shadow Generations - Sunset Heights (Act 1+2 Mix)

Remastered combined Act 1-2 mix from the 5th stage Chaos Island.
Sound has been normalized and Act 2 tempo is adjusted to Act 1 (174 BPM).

Arranged by R.B.U. and TORIENA
Based on "Chaos Island movements 2 & 6" from Sonic Frontiers by Tomoya Ohtani

Shadow Generations - Chaos Island (Act 1+2 Mix)

Remastered combined mix from the final boss (Neo) Devil Doom.
Sound has been normalized and Phase 2 tempo is adjusted to Phase 1 (176 BPM).

Arranged by Hidekuni Horita and Jun Senoue
Based on "Black Doom" and "All Hail Shadow" from Shadow the Hedgehog and Sonic the Hedgehog 06 by Yutaka Minobe and Crush 40, respectively.

Shadow Generations - Devil Doom (Full Version)

Just a gamer dude with a fondness for music editing

Shadow Generations - Devil Doom (Full Version)

Sir GG