You can add audio to the aframe.io webVR. It is best to keep the files small, e.g. compress them with .mp3 before you upload them to your Glitch.com project.
You can pre-load audio using Asset Management
Digital Audio is very important for multimedia, such as background music, voice-over and sound effects for games and virtual reality. Use the online 'Getting Started with making music" loop machine on learningmusic.ableton.com & https://learningsynths.ableton.com/
See the presentation and Google Doc below
You can use Audacity to make a recording of what you have made in the Ableton website.
Audacity is a free audio editor for Mac & Windows.
You will have to install extras to be able to export as .mp3
https://www.audacityteam.org/download/
There are some handy tutorials below:
You can learn a little more