One Winged Angel is a mod that will allow you to use the songs samples from the song "One Winged Angel" from Final Fantasy 7 to replace the Alatreon Harmony and Alatreon Revival hunting horns audio. This will allow you to change the music. 

This is not an easy task and will require some experience. Making a mod for Monster Hunter World is not a simple process, and you will have to go through some challenges.

The first thing that you need to do is download the mod and the files that you need to install it. Then go to your Steam Library folder. You need to find the folder named "nativePC" and place the files you need to install in that folder. The installation process is the same for the two horns and the Denden Doomsounder. The files that you need to install are named "One Winged Angel.