A cornerstone in Tortusa´s production is the texture and timbre of sound. He searches for sounds that are out of the ordinary and places the listener in different emotional states. For compositional processes, Tortusa employes both hardware equipment and software including retro tape recorders, modular synthesizers, samplers and a diverse array of other tools.
For several years, Bishop has been composing and performing for modern dance and performance art shows in Norway, England and France. He has made music for short films «Limerence», «Hyperspace» and «Across the dreams». Aside from making music Bishop works with photography.