He has worked with Bugge Wesseltoft, Kari Bremnes, Ole Paus, Ketil Bjørnstad, Frode Alnæs, Silje Nergaard, Arve Henriksen and Knut Reiersrud.
As a composer, he has written a number of commissioned works, music for film and television, vignettes, and the like.
A total of 70 children and adolescents from 20 countries, all residents of Bergen, are actors on stage and the performances have had over 25,000 visitors.
Hamre is also the man behind the human organ Folkofonen, an audiovisual instrument for communicating art consisting of video and sound of people singing a long tone.
Within this concept, Hamre produced numerous audiovisual performances and films on behalf of the business community, among others Norsk Hydro, Statoil and "BIR".