RDA-L readers,
A search by ti:duets retrieved 1,616 results. Here are some cases of "duet" and its cognates appearing in part of a title in a name authority record: Arban, J.-B. ǂq (Jean-Baptiste), ǂd 1825-1889. ǂt Méthode complète de cornet à pistons et de saxhorn. ǂp Duets, ǂm cornets Busch, Adolf ǂd 1891-1952. ǂt Hausmusik. ǂp Duett, ǂn no. 1 Clementi, Muzio, ǂd 1752-1832. ǂt Duet, sonatas, and fugues, ǂn op. 6. ǂp DuetErbach, Friedrich Karl, ǂc Graf zu, ǂd 1680-1731. ǂt Divertimenti armonici. ǂp Duetti I'm not sure whether these examples relate to Maliheh Dorkhosh's question, or Mark Ehlert's answer. Sincerely - Ian Ian Fairclough - George Mason University - ifairclough43...@yahoo.com