Notice / TL;DR
This resource pack does not add or change any audio files, it only changes Minecraft's "sounds.json" file to adjust the soundtrack arrangement. If you're looking for a "Raineremover" style resource pack, this is one of them.

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Introduction
I've played Minecraft since June 15th, 2011. What makes me love this game so much is how C418's soundtrack perfectly encapsulates the experience and makes it unique each time. He made this masterpiece almost completely by accident, not even trying to make something perfect, but something that works. Many players and I share common feelings and nostalgia with this soundtrack, it's practically synonymous with the Minecraft experience many of us grew up with, and many people were introduced to the game through it.

While the new music by Lena Raine, Kumi Tanioka, and Samuel Åberg is decent and I don't think any of us is saying it's bad, we prefer the old soundtrack and to us this new soundtrack doesn't manage to capture the same feelings nor experience(s) as the original. It feels almost shallow and unnatural, an imitation of the original that just doesn't sit right.

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Explanation
This pack removes all of the post-1.16 soundtrack except for Rubedo and Ancestry, and makes it so the style in which Minecraft's soundtrack is played, stays the way it has always been: Not specifically catered to an in-game situation outside of special scenarios such as different dimensions, the ender dragon fight, creative mode, being underwater, etc. - The new biomes aren't an exception to break this unspoken rule.

In these recent updates, the new music can play (with added "weight", meaning they play more often) in the new biomes, some only in new biomes. Minecraft is about creation, new experiences, memories. Re-creating the same experience for the same area is not something that belongs in this game (aside from the aforementioned exceptions), even if it works well in other games such as Terraria, Valheim, Subnautica, TerraTech, etc.

With this pack, all biomes will now play the pre-1.16 (C418) soundtrack and nothing specifically within individual biomes (aside from the Deep Dark). Because it feels they fit the game thematically, I kept "Rubedo" and "Ancestry". There may be other outliers aside from those two, but that's pretty much it. If you'd like to know more, you can read the specifics below.

If you have any suggestions, please feel free to comment and let me know!

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Specifics
Here's a list of the changes I've made!

Overall
- The post-1.16 soundtrack, aside from "Rubedo" and "Ancestry", has been removed intentionally due to the reasoning explained above.

Main Menu
- The main menu will play the original menu tracks from pre-1.16.

Overworld
- Most biomes feature the pre-1.16 soundtrack.

Deep Dark
- "Ancestry" plays as normal, however "Boss" was added.
-- The volume of "Boss" has been lowered to a bit above half when playing here considering it's a little loud outside of the End.

Cherry Grove & Flower Forest
- Play their new music as normal

Nether
- The pre-1.16 nether soundtrack and "Rubedo" plays in all Nether biomes.
-- The Warped Forest, as is normally, does not have music.

The End
- All End tracks play (End, Boss, Credits) and "Ancestry" was added.

Ender Dragon Fight
- "Rubedo" was added alongside "Boss".

Creative Mode
- "Dragon Fish" from the 1.13 soundtrack was added to what can play alongside the other six tracks as normal.