This mod is a remake of the OST and some of the ambience tracks for the second game.

The original soundtrack was mainly replaced with their performance by the Royal Philarmonic Orchestra. Some ambience sounds are shared across different levels so I didn't touch those ones up too much except for the wreck. I kept the original backing track but are now mixed with a more consistent and present ambience. SFX are untouched. The secret chimes have been updated.
I tried to keep the original vibe of the game with a very silent ambience. TR2 has more "music SFX" and jingles than TR1 so this mod is less heavy than the one I made for TR1. TR1 has a lot of reused and much longer songs across the levels, that were performed by the RPO. TR2 samples are also better quality so the old-fashioned tracks shouldn't be too noticeable.

I'd recommend using this mod if you've already played TR a lot and want to play the game with a brand new SOUND experience. The soundtrack has simply been "upscaled" in quality so it sounds crisp but the samples are the same as in the original 1996 game which I found to sound a bit too "old fashioned" in comparison with the very fresh and modern graphics. Some like the charm of it. I'm not a fan of it given how good the game looks, I'd have loved a better makeover of the soundtrack. To each their own!

Here's the song list

("track file number" - "original game track" => "modern track")

27 - Maria Doria (Ambience) => Cave ambience music by LittleRobotSoundFactory (copyright free) mixed with the original ambience sound for fidelity reasons
29 - Wind (ambience) => Desert ambience sound (copyright free) by Sound Diary
35 - Soprano choirs (Ambience track played during the game) => Temple of Xian (Orchestra) (Temple of Xian is a long track with ambience cellos and choirs that reproduces those "choir/basses ambience" TR2 has. I just isolated the part with the sopranos)
36 - Venice => Venice (Orchestra)
41 - Vertigo => Vertigo (Orchestra) shortened
43 - Secret chimes => Secret chimes from TRA (altered pitch) (if you want to keep the original track, don't copy and paste this one)
48 - Skidoo => Skidoo (Orchestra)
51 - Ambience basses and choirs => Temple of Xian (Orchestra) (same situation as track 35)
60 - Tomb Raider 2 Theme => Tomb Raider 2 Theme (Orchestra)

All rights to the original composers. If you do NOT want your music to be featured in this mod, please inform me as soon as you can!

*Installation*

1 - Find the TRACKS folder of Tomb Raider 1 at C:\Programs\steamapps\common\Tomb Raider I-III Remastered\2\TRACKS
2 - Make a backup of the TRACKS folder (copy and paste it somewhere else so you can reinstall the original tracks if you want)
3 - Copy the content of the ORCHESTRA_REPLACEMENTTR2 folder you've downloaded 
4 - Paste it in that TRACKS folder you made a backup of (at C:\Programs\steamapps\common\Tomb Raider I-III Remastered\2\TRACKS)
5 - Your system will ask you if you wish to replace the files. Select "yes". Done!