Copied this from another forum, formatting may suffer:
Also, most of these songs are not what you might call mainstream. Some of these songs do not utilise traditional instruments. Most of the songs are instrumental. These songs fall into different genre categories.
SPOILER - Click to view
Michal Jelonek - BaRock (youtube.com/watch?v=QMamJvNAhdE)
Michal Jelonek - B.East (youtube.com/watch?v=9FYZHv720Nk)
Michal Jelonek - Vendome 1212 (youtube.com/watch?v=PJAC6oIf9bI)
Michal Jelonek - Funeral of A Provincial Vampire (youtube.com/watch?v=sYC_d0Ey0hA)
Michal Jelonek - War In the Kids’ Room (youtube.com/watch?v=5pm4bmMh4Lo)
Michal Jelonek - Mosquito Flight (youtube.com/watch?v=DIK5tk80RdU)
Michal Jelonek - Machine Hat (youtube.com/watch?v=Ajhjcv6_lzo)
Michal Jelonek - Lorr (youtube.com/watch?v=h3v0yA2Bw08)
Michal Jelonek - Owl’s Pathetic Song (youtube.com/watch?v=wgo9LRDiSdM)
Michal Jelonek - WolfRed (youtube.com/watch?v=W4rAIMfglZ0)
Michal Jelonek - Magic Night In the Slaughterhouse (youtube.com/watch?v=uLvSfmqu1h4) - Awesome name for a song
Michal Jelonek - Romantic Revenge (youtube.com/watch?v=Dvv0a_FCrrs)
Michal Jelonek - SchizoFerret (youtube.com/watch?v=vieCfpP4Htc)
Michal Jelonek - Cementary Woodpeacker [sic] - (youtube.com/watch?v=BACOUI2_xZc)
Michal Jelonek - Lord Mantis Dilemma - (youtube.com/watch?v=mh2IeSLrg_g)
OCRemix Shadow of the Colossus - Wandered On the Offensive (youtube.com/watch?v=IdhPe1udAHM)
OCRemix Panzer Dragoon Orta - More Than A Weapon (youtube.com/watch?v=HRHp1SzC82k)
OCRemix Deus Ex: Sonic Augmentation - The God Machine (Medley) (youtube.com/watch?v=8fnvArZlHtQ)
OCRemix Deus Ex: Sonic Augmentation - Ma Chérie Nicolette (youtube.com/watch?v=J4i16znER9I)
Big Giant Circles - Impostor Nostalgia 15 “Antimatter Factory” (youtube.com/watch?v=SrZ9uQV9yOE)
Big Giant Circles - The Clubbing of Isaac - (youtube.com/watch?v=225qkYqHB5w)
E.S. Posthumus - Vishnu (youtube.com/watch?v=4uO9tyyjRd4)
E.S. Posthumus - Indra (youtube.com/watch?v=tASQLN_EjPM)
E.S. Posthumus - Arise (youtube.com/watch?v=aiYwrmyywRY)
E.S. Posthumus - Pompeii (youtube.com/watch?v=GusLypfx7OQ)
E.S. Posthumus - Krosah (youtube.com/watch?v=YUAULf3b8i0)
Feint - That Makes One (youtube.com/watch?v=Nr1WuUO4BTs)
Feint - Laurence (youtube.com/watch?v=Q77LWPmAp4k)
Feint - Clockwork Hearts (youtube.com/watch?v=32pHvXsxa9o)
Feint - Paradise Lost (youtube.com/watch?v=wZ8HB7XwVAM) minor lyrics
Feint - Atlas (youtube.com/watch?v=vEhEUiEY_Qg)
Apocalyptica - Master of Puppets (youtube.com/watch?v=PH68Z6ysqZs)
Apocalyptica - Somewhere Around Nothing (youtube.com/watch?v=Ogx0LV35meA)
Apocalyptica - Hope (youtube.com/watch?v=qeWTsbkw57E)
Lindsey Stirling - Shadows (youtube.com/watch?v=JGCsyshUU-A) not so obscure
Lindsey Stirling - Crystallize (youtube.com/watch?v=aHjpOzsQ9YI) not so obscure
Bastion OST - Twisted Streets (youtube.com/watch?v=qqQzvuUmf4s)
Bastion OST - The Bottom Feeders (youtube.com/watch?v=js4w6sgxBQE)
A. Armada - Fall/Triumph (youtube.com/watch?v=eXn0K3H8ZUY)
DJ Deku - Migratory Bird From North (youtube.com/watch?v=FBtCHqBiNq4)
Seiklus Soundtrack - Sanxion (youtube.com/watch?v=N6irSWE54Tg) chiptune
Savant - Wildstyle (youtube.com/watch?v=25_gj_ZswCs)
Metal Gear Rising: Revengance OST - Red Sun (youtube.com/watch?v=chPJ7x9iMw0)
Ace Combat 3: Electrosphere OST - The Execution (youtube.com/watch?v=-2_km-xdCgE)
EastNewSound - Lucid Dream (youtube.com/watch?v=a1yQH20FBFk) this is the instrumental version
Atlas Plug - Truth Be Known (youtube.com/watch?v=WXNkfwOqosA)
Castlevania Orchestral and Quitar Cover - Clock Tower (Aria of Sorrow) (youtube.com/watch?v=jLE3BVf_Oww)
The Glitch Mob - Animus Vox (youtube.com/watch?v=17PM-UMVud8)
Histories of X and Y (Dwarf Fortress Theme Rock Cover) (youtube.com/watch?v=mXbTXfoloNc)
Kalafina - Magia (Slow) (youtube.com/watch?v=7HIoCUgyCaE) Actually has lyrics, which are in Japanese
Mythos - Departure (Rockman Zero Remastered Soundtrack) - (youtube.com/watch?v=lhJpfXUGW00)
Portal 2 OST - The Part Where He Kills You (youtube.com/watch?v=k5NJ4Wf2guo)