Im looking for the name of the tune that Johann Krauss breaks into song when he is walking away from Hellboy 2?

Im looking for the name of the tune that Johann Krauss breaks into song when he is walking away from Hellboy in the movie Hellboy 2 after their little quarrel about Hellboy's temper. Its some kind of German melody and I'd liek to know what it was so i could sing it as well!