Gudni has appeared as a soloist throughout Europe, in Brazil, Canada and the former Soviet Union and has recorded numerous CDs both with classical and new music as well as folk music. In addition, he regularly records for Radio and Television. He is a co-founder and co-artistic director of CAPUT.
Gudni Franzson also works as a composer. He has written music for numerous theatre and dance productions, chamber music, music for children and music for unconventional instruments (e.t. ceramics). He has been active on the dance and theatre scene, works with groups like Pars Pro Toto, Bandamenn and at the Icelandic National Theatre.