Matjaž led the music program at Kinu Šiška in Ljubljana during the period 2009–2024. He co-founded and co-managed the MENT Ljubljana festival from 2015 to 2021. Since February 2024, he has been the head of international activities for the European Capital of Culture Nova Gorica 2025. Actively involved in the music world since 1996 as a musician in various “noise rock” bands (Štirje Pravi Dedci – opened for Fugazi in 1999), free improv (Alzhejmer trio), and experimental bands/projects (BAST). He was a radio activist at Radio Študent as a DJ, and later a music editor from 1996 to 2003. He initiated the “Klubski maraton” project at Radio Študent in 2001, served as the coordinator of the CrossRadio network of ex-YU independent radio stations from 2001-2008, worked as a club DJ, promoter, and producer of domestic and international music events, and was an editor at the rx:tx music label in 2004/5. In 2005, he founded the Kataman Music Action association for production and promotion and led its activities until 2009.