5521contrabassoonsTTen-USVocabulário Colaborativo em Artes e Arquitetura active approved contrabassoonsBassoons pitched below the regular bassoon, with the tube usually, though not always, bent back upon itself several times in order to reduce the overall length and bring the keys within convenient playing position.

Source: Art & Architecture Thesaurus

http://vocab.getty.edu/page/aat/300042444

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