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Österreichische Nationalbibliothek, Vienna (A-Wn): Mus.Hs.11393
||Sonata a Sette in E-flat major
|Composer Time PeriodComp. Period
||flauto d'amore, English horn, trumpet, glockenspiel, viola d'amore, cello, harpsichord|
Echo - flauto d'amore, cor anglais, trumpet, cello
Though the title is Sonata "for seven", the echo parts are separate, and the main part has rests while the echo plays. It thus seems to be that 11 are required to play this piece.