Read the following paragraph and determine if the hypothesis is true:

A Student's Song of Heidelberg (German:Ein Burschenlied aus Heidelberg) is a 1930 German musical film directed by Karl Hartl and starring Hans Brausewetter, Betty Bird and Willi Forst. It marked Hartl's directoral debut. The film is in the tradition of the nostalgic Old Heidelberg.

Hypothesis: Hans Brausewetter sang in a baritone voice. 
It's impossible to say