| Artist name | Roles | Recordings |
|---|---|---|
| Kristoffer Sundberg | ||
| B. Deutung | cello | Freiheit, No Future in Gold |
| Alex Midi (Dance music. Known for "In the Air Tonight".) | ||
| Delaware (Slovenian band) | ||
| Eric Corne |
| Artist name | Roles | Recordings |
|---|---|---|
| B. Deutung | cello | Freiheit, No Future in Gold |
| Peter Heppner | vocal | Lustschmerz (feat. Peter Heppner) |