I absolutely LOVE this!! Very interesting to hear a Leblanc paperclip Bb contra, Linton (Orsi) Bb contra clarinet, Selmer (Paris) rosewood Bb contra, and Buffet Eb contra all in one video, and all very well played!!
I've played contrabass clarinet and other woodwinds but am primarily an organist; large pipe organs in big, reverberant spaces are even more fun to play, IMHO!