I have uploaded clips from this movie and Musikantenstadl with St. Florianer Sängerknaben. Latter one having Lederhosen and sailor suits. I have 2 clips from that but the other is already available in better quality. My 11 minute clip has the boy soprano Alois Mühlbacher as well.
https://sailorsuitsandlederhosenfilmblog.blogspot.com/2011/12/der-czardas-konig.html
https://sailorsuitsandlederhosenfilmblog.blogspot.com/2011/11/st-florianer-sangerknaben.html
