Does OST include every song I can hear in the game?

[IIIIIIIIIIIIIII_IIIIIIIIIIIIIII]

I'd really like to buy it, but I'm afraid some of the songs are not included.

[arejang]

I don't have it, but I've read threads from others who said only the base game's soundtrack is included. None of the extra DLC stuff is there.

[Smug Hatterene]

Missing tracks include, White Defender, Grey Prince Zote, Grimm, Nightmare King, Fog Canyon(though that's a variant of Greenpath), Dreamer theme, and Birthplace.

Almost every other track is in the OST.

[Aeternalis the Abyssal Alchemist]

The OST is missing the DLC tracks and some of the ambient tracks.

Which is unfortunate, because Troupe Leader Grimm is one my favorite songs in the game.

Thankfully, the musician (Christopher Larkin) for Hollow Knight uploaded both Grimm, and Nightmare King to his Youtube channel.
Grimm: https://www.youtube.com/watch?v=qmsjvBivRkU
Nightmare King: https://www.youtube.com/watch?v=Mq8E_1LkoAc

You can find most of the missing ambient tracks on TheEmbracedOne's Youtube channel. He's the wiki administrator.
EmbracedOne's Youtube channel: https://www.youtube.com/user/SunyiGomba

[IIIIIIIIIIIIIII_IIIIIIIIIIIIIII]

Originally posted by Festive Lurantis:

Missing tracks include, White Defender, Grey Prince Zote, Grimm, Nightmare King, Fog Canyon(though that's a variant of Greenpath), Dreamer theme, and Birthplace.

Almost every other track is in the OST.

Too bad some of the best are missing. I'm really fond of Birthplace theme and Marissa's song, it were these tracks that made me convinced to buy the game.

[Лич Картодел]

Deepnest, Waterways, Hive... lot os music are apsend in OST pack

[Aeternalis the Abyssal Alchemist]

Originally posted by Лич Картодел:

Deepnest, Waterways, Hive... lot os music are apsend in OST pack

Deepnest of Waterways technically aren't music tracks, they're ambient tracks that are looped every 30 seconds or so.
I don't even remember what The Hive's ambience sounds like.