[1] Some of his works have been written for classical ensembles, such as the Iceland Symphony Orchestra, the Orchestre philharmonique de Radio France, and the Kronos Quartet.

[4] Úlfur's music also incorporates microtonalism to a varying degree, with some of his works being written entirely for custom tuning arrangements.

Arborescence was produced by Randall Dunn (Sunn O))), Earth (American band), Marissa Nadler, etc.

Weightlessness was premiered at the Dark Music Days Festival in 2016, and later released as part of the composers solo album Arborescence in 2017.

Orchestral piece written for microtonal string orchestra by commission from Israeli conductor Ilan Volkov, woodwinds and percussion.