I've listened to a lot of retro vgm lately and love to find out the OSTs that make the most out of a certain chip or card. Sticking with PC for now, I'll go with these:
OPL2/Adlib:
Fury of the Furries
Wacky Wheels
Tyrian
MegaRace
Dragon Slayer: TLoH 1-2
Genpei War
The Legend of Sword and Fairy
Rusty
Princess Maker 2
Ys II Special
HM: Empire of the Angel II, Olmang Jolmang Paradise, Iron Blood, Cobi Comi, Zeliard, First Samurai, Eol's Adventure/Eol-ui Moheom, Illusion Blaze, Metal & Lace, Mad Paradox
YMF262/OPL3:
Wacky Wheels
Dune (AdLib Gold)
Puyo Puyo Tsu (Compile, 1996)
Sorcerian Forever
CyberSphere
Ant Man
Kamui
Doukyusei 1-2
Burntime
Sonic 3 & Knuckles
HM: Tokimeki Memorial: FWY, Giten Megami Tensei: TM, WarCraft 1 & 2, Descent, Theme Hospital, Nectaris, Terra Nova (dual OPL2?), Princess Maker: YY, The Lost Vikings, ES II: Daggerfall
MT-32 (haven't heard that much yet, didn't grow up with it):
Zeliard
Nova 9
Utopia
Inferno
Firehawk: Thexder the Second Contact
Sorcerian
Space Quest III
Double Dragon III
Speedball 2
Strike Commander
EcoQuest: The Search for Cetus, Dune II, King's Table: TLoR, Rex Nebular atCGB, Castle of Dr. Brain, Thunderhawk AH-73M, Silpheed, Adventures of Willy Beamish,
Links to most of these:
http://minirevver.weebly.com/impressive-vgm-by-sound-chip.html