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Found this little drawing on a very interesting historical cartoon art blog - in an article about "der Fuehrer's Face" DONALD DUCK IN NUTZILAND animation. Other bandsmen are shown in the article.

(Some of us would probably figure that the German WW2 army bands didn't use many Sousaphones. Helicons, possibly.)

Here is the finished product: with a short introduction

and a cool Sousaphone image: