We're humans so when senses are stimulated together the experiences are usually better (if well stimulated of course).
You know in a video, music can make the difference between a good video and an unforgettable video.
A background music while visiting a virtual space can also make a great difference to the experience. I'd love to be able to upload background soundtracks (or even choose from some Matterport's partner library, at some point).
Smartphones can support very well music play, so this is something that would also work well across devices.