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Halldorophone
The halldorophone is an experimental musical instrument invented by Halldór Úlfarsson, it is a cello-like, electro-acoustic string instrument specifically intended to feedback the strings. The halldorophone gained some recognition in early 2020 when composer Hildur Guðnadóttir won the Academy Award for her original soundtrack to the movie Joker, some of which was composed with the instrument.