How many movies have Matthias Rau and Oliver Heidemann collaborated on?

They have worked on 3 movies together! Their first movie together was Die Helene Fischer Show 2014 (2014) while their highest rated movie together was Die Helene Fischer Show 2015 (2015). They have not worked together since Die Helene Fischer Show 2018 (2018). They are most known for their music films together.