With iOS 15 seeing its full release Tuesday, you now can install it and start taking advantage of all the new features—including spatial audio through Dolby Atmos. This will provide you with a sort of simulated surround sound that makes it sound like various instruments and vocals are coming from all around you.
In the case of dynamic head tracking, it even gives these audio elements a fixed point in virtual space that changes dynamically. In other words if you turn your head, the audio orientation of the instruments and vocals will appear to change. For example, if it sounds like there are drums to your right and you turn your head in that direction, it will then sound like the drums are in front of you.