Q-Sound for me. Since a surprising amount of people are unfamiliar, these are the games that used the Q-Sound intro....
Super Street Fighter II: The New Challengers
Super Street Fighter II Turbo
Hyper Street Fighter II: The Anniversary Edition
Eco Fighters
Dungeons and Dragons: Tower of Doom
Alien vs Predator
Darkstalkers: The Night Warriors
Night Warriors: Darkstalkers Revenge
Vampire Hunter 2: Darkstalkers Revenge
Ring of Destruction: Slam Masters 3
Armoured Warriors
X-men: Children of the Atom
Cyberbots: Full Metal Madness
Street Fighter Alpha
Mega Man: The Power Battle
Marvel Super Heroes
19XX: War against Destiny
Dungeons and Dragons: Shadows of Mystara
Street Fighter Alpha 2
Super Puzzle Fighter 2
Mega Man 2: The Power Fighters
Star Gladiator
Quiz Nanairo Dreams
X-men vs Street Fighter
Street Fighter EX
Battle Circuit
Vampire Saviour
Vampire Saviour 2
Marvel Super Heroes vs Street Fighter
Capcom Sports Club
Super Gem Fighter Mini Mix
Rival Schools
Marvel vs Capcom
There were a few other games like Strider 2 and Street Fighter Alpha 3 but they used a different jingle. Basically if you were playing CPS2 games between 1993 and 2000 then you should be familiar with the Q Sound tune.
View: https://m.youtube.com/watch?v=8UWgGcRHCgU&pp=ygUXeC1tZW4gdnMgc3RyZWV0IGZpZ2h0ZXI%3D