Halløj i Firmaet - En Kontoropera for six singers and ensemble. Piano reduction for Accordion. This Chamber Opera was composed by Peter Bruun in 2012 and features libretto by Jesper Bræstrup Karlsen.
| Arrangement | Accordion, Piano Accompaniment, Voice |
| Genres | Opera, Post-1900 |
| Format | Vocal Work |
| NumberOfPages | 150 |
| Media | Sheet Music |
| Publisher | Edition Wilhelm Hansen |
| Contributors | Bruun, Peter (Composer) Bræ strup-Karlsen, Jesper (Lyricist) |
| Language | Danish |
| ISBN | 9788759879061 |