Source of duos: Gentile (1642)
Giovanni Gentile, Solfeggiamenti et ricercari a due voci (Lodovico Grignani, Rome 1642) RISM: 1642/6
14 textless duos by various composers.
This was the first collection to use the term «solfeggiamento» in the title-page, though the single duos are constantly labelled «ricercata». There are barlines throughout the whole collection and all the bars are numbered, as you may see from the incipit of each duo.
Furthermore, both parts of each duos bear two distinct sets of clefs, allowing the performers to sing the duos either in tone or lower a fifth or a fourth.
Upper part-book: «CANTO»
Lower part-book: «TENORE»
contents
Dedicatees
facsimiles
literature
all_duo (14)
by_composer: desideri  (1)   gentile c. (1)   gentile g. (12)  
all_duo
1.RICERCATA PRIMA.

Bornstein, Gentile
2.Del Signor Carlo Gentile Nipote, e Discepolo dell'Autore. RICERCATA SECONDA.Composed by Gentile's pupil and nephew Carlo Gentile.
Bornstein, Gentile
3.RICERCATA TERZA.

Bornstein, Gentile
4.RICERCATA QVARTA.

Bornstein, Gentile
5.RICERCATA QVINTA.

Bornstein, Gentile
6.RICERCATA SESTA.

Bornstein, Gentile
7.RICERCATA SETTIMA.

Bornstein, Gentile
8.RICERCATA OTTAVA.

Bornstein, Gentile
9.RICERCATA NONA.

Bornstein, Gentile
10.RICERCATA DECIMA.

Bornstein, Gentile
11.RICERCATA VNDECIMA.

Bornstein, Gentile
12.RICERCATA DVODECIMA.

Bornstein, Gentile
13.RICERCATA TERZADECIMA.

Bornstein, Gentile
14.RICERCATA DECIMAQVARTA. Del Signor Marco Aurelio Desiderij da Palliano Discepolo dell'Autore.Composed by Gentile's pupil Marco Desideri.
Bornstein, Gentile
dedicatees and other people mentioned in this opus
Francesco Maria Brancaccio (1592 - 1675)Dedicatee.
Place and date of the dedication: «Rome, 08.06.1642».
The dedication is signed by Marco Aurelio Desiderii, Gentile's pupil and composer of one of the duos.
literature
Bornstein, Italian Duos, vol. I, p. 44, 181-86, 202; vol. II, p. 220-23. A study of the Italian duo throughout the Renaissance and the Baroque.
Bologna: Civico Museo Bibliografico Musicale, Catalogo Gaspari online.See the related record from the online database of this library.
Gallery of images from this source
Title-page Dedication Foreword to the reader Musical Example