According to his Bio on Bandcamp Declan is a Singer, Songwriter, Bassist, Guitarist, Composer, Producer. Ambient, Rock, Blues, Metal. Indie Rocker from Dublin, but other than that I really don’t know a lot about him.
Clearly he produces a lot of music, just go and look at his Spotify and Bandcamp pages to see how much and a lot of the music is in the Ambient genre which I find captivating. I’m no expert in Ambient but I really like a lot of what I’ve heard of Declan’s music, hopefully you will too. Go check it out.