This Unreal Engine 5.4 video is about the sounds of Music, and, er, Sound.
We start by importing a Sound Effect and a Music Track, and show how you can easily Play a Sound. Next we create a Mini Sound Manager, using a variable where String is Mapped to Sound Base (An Enum Key is better, and a Data Table is likely even better). We create the Sound Class Objects, setting the Master as Parent to Music and Sound Effects, and then play some Music, and show how the volumes of Master vs Music in the calls to Set Sound Mix Class Override (and Push Sound Mix Modifier) are used.
Some Game Music [120bpm] - Freesound - Some Game Music [120bpm] by Seth_Makes_Sounds
An Unreal Forum Post, by vlab22, about Sound Classes/etc - Tip: Audio Mixer level/volume control for Master, SFX and Music
https://dev.epicgames.com/community/learning/tutorials/Y4mp/unreal-engine-45-sounds-and-music-let-s-make-a-tower-defense-game