Impressive YM3812/OPL2/Adlib (PC, ARC) Music
Some PC games had Stereo/Dual OPL2 support (included with Sound Blaster Pro CT1330 and later), and arcade games sometimes used the OKIM6295 or K053260 chip for samples. Here's a good presentation video on the first Adlib card by LGR. The later Sound Blaster cards included a 1-channel 8-bit DAC for samples, but very few OSTs combine FM and samples (not sure why).
For some games, tricks were used to make the Adlib chip work like a 6-bit DAC for sampled sfx and (very rarely) music. Examples: Super Jeopardy, Bill & Ted's Excellent Adventure.
More info on Adlib and its relation to midi music on PC can be found in this blog post by someone who was a demoscener back in the day.
Wacky Wheels
S.P.Y.: Special Project Y (ARC)
Fury of the Furries
Genpei War/Genpei Kassen (added stereo or Dual OPL2?)
Rollergames (ARC)
Tyrian
MegaRace (PC)
The Legend of Sword and Fairy
Cobi Comi(added stereo/reverb?)
Zone 66 (SB ver., FM+samples)
Empire of the Angel II
Olmang Jolmang Paradise
Sword of Xuan Yuan II (Legend): Dance of Maple Leaves (PC, OPL3?)
Princess Maker 2 (PC)
Dragon Slayer: TLoH (PC), Dragon Slayer: TLoH 2 (PC)
Ys II Special
Haunted Castle (ARC, added reverb?)
Eol's Adventure/Eol-ui Moheom
Illusion Blaze
Mad Paradox
Iron Blood
Rusty (PC, OPL2)
Harald Hårdtand i 'Kampen om de rene tænder' (PC)
Zeliard (PC, OPL2)
Dig it!
First Samurai
Metal & Lace: The Battle of the Robo Babes
Fuzzy's World of Miniature Space Golf
Universe
Zyclunt/Blade Warrior (FM+samples)(in-game)
Amberstar (Dual OPL2/OPL3?)
Pee & Gity
Mad News (FM+samples)
Street Smart (ARC)
Formation Armed F (ARC, added reverb)
Steel Empire/Cyber Empires (OPL3?)
Metaltech: Earthsiege (FM+samples)
Metaltech: Battledrome (FM+samples)
Pyrotechnica (PC, OPL3?)(w/ commentary)
X-COM: UFO Defense (Dual OPL2?) & Terror from the Deep
Shakii the Wolf
SAR: Search And Rescue (ARC)
Marble Cooking
Stunts
Totsugeki! Mix (PC)
P.O.W.: Prisoners of War (ARC)
Pee & Gity Special
Zero Team (ARC)
Vanslug: X Mission
Lychnis
TFX: Tactical Fighter Experiment, Inferno (OPL2), Dune (PC) & Dune 2 (PC, dual OPL2?), KGB (PC), S.T.U.N. Runner (PC), Dokkaebi-ga Ganda (PC), Descent (OPL2), Modaozi (Prince of Evil), Alpha Waves/Continuum, Magic Pockets (PC, OPL2+samples),
Hired Guns (PC), Prehistoric Isle in 1930 (ARC), Diggers (FM+samples), Reon-ui Moheom, Stone Age, Laser Squad (PC), Lollypop, HMI Sound Setup Utility, Dragon Force: The Day 3 Super Real Darwin (ARC),
Supaplex, Out Zone (ARC), Vimana (ARC), System Shock (Dual OPL2?), Three Sisters' Story, Doofus, MiG-29, Double Dragon 3 (PC), Zeppelin: Giants of the Sky (OPL3?), Skunny Kart (PC),
Subtrade: Return to Irata (FM+samples), Adlib Jukebox Songs, 1869 (PC), Der Clou/The Clou, Enchantasy: QftEG, Azrael's Tear, Ikari III (ARC), The Light Corridor, Lost Eden (PC, OPL2), The Incredible Machine 1-2,
Cold Dreams (FM+samples), Fox Ranger (PC), Mirage Thunder (OPL2), Wolf, Hellfire (ARC), Bill & Ted's Excellent Adventure (FM+6-bit Adlib samples), Zero Wing (ARC), Tempest 2000 (PC), Theme Hospital (PC, OPL2), Runaway City (PC, OPL2?),
Best of the rest
Fanmade remixes and homebrew originals:
Dancing on the Glass, https://www.youtube.com/watch?v=vb5c145vk8o
https://www.youtube.com/watch?v=SvuCkRvqulA
https://www.youtube.com/watch?v=FJhVaHZCsRc
Angry Birds
Jens-Christian Huus - Crooner
Laxity and Jens-Christian Huus - The Alibi (AMI - Tiny Tune (Deluxe Galaga)/C64 cover)
Streets of Rage - Intro
Check: Ultima VII: The Black Gate - find adlib, Albion PC - find adlib or adlib gold, Space Hulk 1993, Heroes of Might and Magic 2 - find adlib, Sky Robo (ARC 1989) - find, KULT: The Temple of Flying Saucers - find ost, Dragon Lore - no adlib version?, Lost Eden - no adlib ver?, Atlantis: The Lost Tales - no adlib ver?, Hexen: Beyond Heretic - find adlib, Bug Bomber - no music?, M1911/Honda W3DE - find?, Strife - find adlib ost?, David Leadbetter's Greens - find vid w/ sound, High Command: Europe 1939-'45 - find, The Koshan Conspiracy - no adlib?, Heartlight - no adlib?, Chess Housers - find, Network Q RAC Rally - no adlib?, Literki - Cyferki - find, Star Wars: Rebel Assault - no adlib?, Silverball - no adlib?, Eight Ball Deluxe - no adlib?, Smus- no adlib?, ABC-Talk - find, 3x Logic Games - find, Rosemary West's House of Fortunes - no adlib?, Dracula Unleashed - no adlib?, SimCity: Enhanced CD-ROM - no adlib?, The Last Eichhof - no adlib?, Magiczne Karty - find, Gary Grigsby's War in Russia - no adlib?, Clash of Steel: World War II, Europe 1939-45 - no adlib?, Saper - find, NHL 95 - no adlib?, Crime Patrol - no adlib?, Pinball Fantasies - no adlib?, Relentless: Twinsen's Adventure/Little Big Adventure - no adlib?, Cyberia - no adlib?, Under a Killing Moon - no adlib?, The Legend of Kyrandia: Book 3 - MR - no adlib?, Commander Blood - no adlib?, Cyberdogs - no music?,
Dual OPL2 list by nerdly pleasures (seems a bit incomplete): http://nerdlypleasures.blogspot.se/2012/04/unique-pc-hardware-game-support.html
Samples+FM OSTs:
Gods (1991), 4D Sports Boxing (1991), Magic Pockets (1992), Subtrade: Return to Irata (1992), WWF Wrestlemania (1992), Wacky Funsters (1992), Blue Force (1993), Zone 66 (1993), Mad News (1994), Diggers (1994), Earthsiege (1994), Battledrome (1994), The Fortress of Dr. Radiaki (1994), Zyclunt (1995), Apache/Apache Longbow? (1995), Cold Dreams (1995), Protostar (1993), Under a Killing Moon (1994, in-game)
For some games, tricks were used to make the Adlib chip work like a 6-bit DAC for sampled sfx and (very rarely) music. Examples: Super Jeopardy, Bill & Ted's Excellent Adventure.
More info on Adlib and its relation to midi music on PC can be found in this blog post by someone who was a demoscener back in the day.
Wacky Wheels
S.P.Y.: Special Project Y (ARC)
Fury of the Furries
Genpei War/Genpei Kassen (added stereo or Dual OPL2?)
Rollergames (ARC)
Tyrian
MegaRace (PC)
The Legend of Sword and Fairy
Cobi Comi(added stereo/reverb?)
Zone 66 (SB ver., FM+samples)
Empire of the Angel II
Olmang Jolmang Paradise
Sword of Xuan Yuan II (Legend): Dance of Maple Leaves (PC, OPL3?)
Princess Maker 2 (PC)
Dragon Slayer: TLoH (PC), Dragon Slayer: TLoH 2 (PC)
Ys II Special
Haunted Castle (ARC, added reverb?)
Eol's Adventure/Eol-ui Moheom
Illusion Blaze
Mad Paradox
Iron Blood
Rusty (PC, OPL2)
Harald Hårdtand i 'Kampen om de rene tænder' (PC)
Zeliard (PC, OPL2)
Dig it!
First Samurai
Metal & Lace: The Battle of the Robo Babes
Fuzzy's World of Miniature Space Golf
Universe
Zyclunt/Blade Warrior (FM+samples)(in-game)
Amberstar (Dual OPL2/OPL3?)
Pee & Gity
Mad News (FM+samples)
Street Smart (ARC)
Formation Armed F (ARC, added reverb)
Steel Empire/Cyber Empires (OPL3?)
Metaltech: Earthsiege (FM+samples)
Metaltech: Battledrome (FM+samples)
Pyrotechnica (PC, OPL3?)(w/ commentary)
X-COM: UFO Defense (Dual OPL2?) & Terror from the Deep
Shakii the Wolf
SAR: Search And Rescue (ARC)
Marble Cooking
Stunts
Totsugeki! Mix (PC)
P.O.W.: Prisoners of War (ARC)
Pee & Gity Special
Zero Team (ARC)
Vanslug: X Mission
Lychnis
TFX: Tactical Fighter Experiment, Inferno (OPL2), Dune (PC) & Dune 2 (PC, dual OPL2?), KGB (PC), S.T.U.N. Runner (PC), Dokkaebi-ga Ganda (PC), Descent (OPL2), Modaozi (Prince of Evil), Alpha Waves/Continuum, Magic Pockets (PC, OPL2+samples),
Hired Guns (PC), Prehistoric Isle in 1930 (ARC), Diggers (FM+samples), Reon-ui Moheom, Stone Age, Laser Squad (PC), Lollypop, HMI Sound Setup Utility, Dragon Force: The Day 3 Super Real Darwin (ARC),
Supaplex, Out Zone (ARC), Vimana (ARC), System Shock (Dual OPL2?), Three Sisters' Story, Doofus, MiG-29, Double Dragon 3 (PC), Zeppelin: Giants of the Sky (OPL3?), Skunny Kart (PC),
Subtrade: Return to Irata (FM+samples), Adlib Jukebox Songs, 1869 (PC), Der Clou/The Clou, Enchantasy: QftEG, Azrael's Tear, Ikari III (ARC), The Light Corridor, Lost Eden (PC, OPL2), The Incredible Machine 1-2,
Cold Dreams (FM+samples), Fox Ranger (PC), Mirage Thunder (OPL2), Wolf, Hellfire (ARC), Bill & Ted's Excellent Adventure (FM+6-bit Adlib samples), Zero Wing (ARC), Tempest 2000 (PC), Theme Hospital (PC, OPL2), Runaway City (PC, OPL2?),
Best of the rest
Fanmade remixes and homebrew originals:
Dancing on the Glass, https://www.youtube.com/watch?v=vb5c145vk8o
https://www.youtube.com/watch?v=SvuCkRvqulA
https://www.youtube.com/watch?v=FJhVaHZCsRc
Angry Birds
Jens-Christian Huus - Crooner
Laxity and Jens-Christian Huus - The Alibi (AMI - Tiny Tune (Deluxe Galaga)/C64 cover)
Streets of Rage - Intro
Check: Ultima VII: The Black Gate - find adlib, Albion PC - find adlib or adlib gold, Space Hulk 1993, Heroes of Might and Magic 2 - find adlib, Sky Robo (ARC 1989) - find, KULT: The Temple of Flying Saucers - find ost, Dragon Lore - no adlib version?, Lost Eden - no adlib ver?, Atlantis: The Lost Tales - no adlib ver?, Hexen: Beyond Heretic - find adlib, Bug Bomber - no music?, M1911/Honda W3DE - find?, Strife - find adlib ost?, David Leadbetter's Greens - find vid w/ sound, High Command: Europe 1939-'45 - find, The Koshan Conspiracy - no adlib?, Heartlight - no adlib?, Chess Housers - find, Network Q RAC Rally - no adlib?, Literki - Cyferki - find, Star Wars: Rebel Assault - no adlib?, Silverball - no adlib?, Eight Ball Deluxe - no adlib?, Smus- no adlib?, ABC-Talk - find, 3x Logic Games - find, Rosemary West's House of Fortunes - no adlib?, Dracula Unleashed - no adlib?, SimCity: Enhanced CD-ROM - no adlib?, The Last Eichhof - no adlib?, Magiczne Karty - find, Gary Grigsby's War in Russia - no adlib?, Clash of Steel: World War II, Europe 1939-45 - no adlib?, Saper - find, NHL 95 - no adlib?, Crime Patrol - no adlib?, Pinball Fantasies - no adlib?, Relentless: Twinsen's Adventure/Little Big Adventure - no adlib?, Cyberia - no adlib?, Under a Killing Moon - no adlib?, The Legend of Kyrandia: Book 3 - MR - no adlib?, Commander Blood - no adlib?, Cyberdogs - no music?,
Dual OPL2 list by nerdly pleasures (seems a bit incomplete): http://nerdlypleasures.blogspot.se/2012/04/unique-pc-hardware-game-support.html
Samples+FM OSTs:
Gods (1991), 4D Sports Boxing (1991), Magic Pockets (1992), Subtrade: Return to Irata (1992), WWF Wrestlemania (1992), Wacky Funsters (1992), Blue Force (1993), Zone 66 (1993), Mad News (1994), Diggers (1994), Earthsiege (1994), Battledrome (1994), The Fortress of Dr. Radiaki (1994), Zyclunt (1995), Apache/Apache Longbow? (1995), Cold Dreams (1995), Protostar (1993), Under a Killing Moon (1994, in-game)