You can listen to it on your pixel/electron source of choice. We put together a landing page for where the songs are distributed currently! https://caeh.hatcher.be
We appreciate all of your feedback (Newgrounds mostly) on his songs (a few of which are on my profile, the older ones from 2013 which I added more recently), which has helped nudge/encouraged him to be inspired some and create more fun stuff.
Contact me on here if you would like to use any track in your game or video/animation! We can probably work something out, and I can send you the source .wav, or just about any quality .mp3 or .ogg you might need.