Marianne has been a member of several chamber groups (Ensemble 2000: Ensemble for contemporary music and the flutetrio Flutention)

Duo Takemitsu:
Duo for flute and guitar with the guitarist Anders Borbye

Den Jydske Harpetrio:
Trio for flute, viola and harp

Duo Stæhr/Leth:
Duo for flute and piano with the pianist Anne Mette Stæhr