ALTO A ALLOY:
https://www.youtube.com/watch?v=-m5MqGX3RoU&feature=youtu.be
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BRASS TUNEABLE SOPRANO C
https://www.facebook.com/100009860417416/videos/590608754611133/UzpfSTExNjUwNjQyMTc0MzA5NToxNzMyNTExNzA2ODA5MjE3/
ALTO ALLOY TUNEABLE G
https://www.facebook.com/100009860417416/videos/554025751602767/?fref=mentions
ALLOY SOPRANO Eb
https://www.facebook.com/100009860417416/videos/vb.100009860417416/565915103747165/?type=2&video_source=user_video_tab