Best musical intro of the game

"What's the world come to" from Sin Episodes
https://youtu.be/kFEXNKplqVU

Higurashi no Naku Koro ni - Nageki no Mori
https://www.youtube.com/watch?v=ezhaUR8sLew
Grisaia no Meikyuu - World End
https://www.youtube.com/watch?v=6Kr-UVVFy7g

Watch dogs 2
https://www.youtube.com/watch?v=TkZmwoRy__c

Not sure if this is musical intro, if you meant like a video or something like that on the steam page then this isn't a musical intro but this is the menu music.

The only thing I liked about KF2:
https://youtu.be/mVirdeU8xLI

Duke Nukem 3D, System Shock, Quake, Link to the Past

Not sure if best means best musical composition, but I remember the Intro of Mass Effect bringing me directly in the right mood for the game. I guess that is, what a good intro should do, right?

How has Persona 5 not been mentioned yet?

Scarface: The World Is Yours

https://www.youtube.com/watch?v=ijCv0wuSx2Q

https://en.wikipedia.org/wiki/Scarface:_The_World_Is_Yours

I'm playing Dragons Dogma atm, that one is very nice too!

Pac-Man World (PS1)

https://youtu.be/4-4hnYG4uzo

A few people have not mentioned.

MGS2 "Metal Gear Solid Main Theme" TAPPY & Harry Gregson-Williams
https://www.youtube.com/watch?v=6kZ5TiSl2d8

Parasite Eve "Theme of Aya" remix of Yoko Shimomura's version
https://www.youtube.com/watch?v=IuxBxIAVZi8

Final Fantasy IX "The Place I`ll Return to Someday" Nobuo Uematsu
https://www.youtube.com/watch?v=vW3QK6CTg2g

Quake, Halo, Arcanum, VTM Bloodlines, Dark Souls III

Disgaea 3 always comes to mind
https://www.youtube.com/watch?v=Hyue6lB4rG8

After all these years, it's still Diablo II. Hands down.

I have very good memories of some old games I used to play as a kid.
Here are 2 of my favourite old game intros: Little Big Adventure 2 and Total Annihilation.
On more recent times, one of the best intros/trailers I've seen is Deus Ex: Human Revolution.
If others come to mind, I'll add them c:

Doom Eternal

To me that would be
Tomb Raider 1996,
Pandemonium 1996,
Omikron: The Nomad Soul 1999
Borderlands 2 2012
and Binary Domain 2013.

To the moon
Ori and the blind forest
DOOM 2016

FF VIII intro always gives me the chills :) https://www.youtube.com/watch?v=q09quI356sQ

Baba Yetu!

megaman 2

Sang Froid - Tales of Werewolves

https://www.youtube.com/watch?v=qMGC6JHEpEA

Age of empires 3