Árni is a graduate from the composition department of the Icelandic Academy of Arts. Besides his composition studies he has also been a prolific keyboard player with a number of bands and artists,
including Of Monsters And Men, Orphic Oxtra, Útidúr, Lay Low, Swords of Chaos and many more.
He has produced a number of songs and had a song featured in the Icelandic movie Borgríki (e. City state) .
Everything he does, he does all by himself.