Go to your library tab in the Steam menu and right click on 'VTOL VR' on the left side of your screen, and a small menu should pop up, Then Hover and click "Manage" inside the menu and then click "Browse Local Files". Doing so will open up your File Explorer on your PC.

Now that your File Explorer is opened and you can see all the games files you want to click on the one that says "RadioMusic". When clicking on it you should be presented with the 3 Stock songs and their strange names. Now it is as simple as dragging and dropping your Favorite Mp3 Files into that Folder. (Make sure you Copy/Paste your Mp3 files.)

Edit Written 7/9/2024.
Question 1: "Will other people hear das Music?"

Answer: It Depends, If in a 2 Seater (Like the T-55 or AH-94) Your co-pilot/Gunner/RIO will indeed hear the music. However Other Players will not hear it when you are flying around or using Comms, However if both planes are Engines off and canopies open, and are Really Really Close, yes you'll hear it faintly.

UPDATED ANSWER: After Experimenting, no, 2 seaters cannot hear eachothers music with a mod. and Being outside the aircraft like really really really really close doesn't work anymore either, some update changed it (Thank you Julian and Maddox for telling me)


Question 2: "Where do you get the MP3 Files?"

Answer: Uhm, P I R A C Y.
(or any sketchy website, You gotta be careful)

2nd Edit: 8/18/2025
Question: Is it Piracy?

Answer: Not technically, after looking into it after being inspired from the comments, No it is not actually piracy to possess the music yourself. So dont like send the files to other ppl (Or do because I cant control you and I couldn't care less)

Question: Is it illegall to modify the Game Files?

Answer: No people do this all the Time, plus the Feds aren't going to careabout you living in your basement playing a indie (but goated) VR Game and freak out when it gets modified.