These three studies can be found in the painting sold in Austria on 30/11/2005 and sold for 32000 euros with a hammer: "Homage to Wolfgang Amadeus Mozart (1867)".
It's the painting exhibited in 1867 at the Salon de Paris at the Palais des Champs-Elysées under the number 752 entitled "The Young Mozart". The libretto completes the title: "The mass that Wolfgang had performed and conducted himself on December 7, in the presence of the whole Court, in the new church of Fr. Parhammer's orphanage, mended what his enemies had ruined by preventing him from having his opera performed, and convinced the Court and the public of the wickedness of our opponents who had flocked in crowds..... (Letter of Leopold Mozart, Vienna, December 14, 1768)"
The differences lie in the hairstyles of the eighteenth century for the painting, but the attitudes of the musicians are the same, they must have been taken from life on musicians of the 1860s.
Signature stamp on the three, perhaps for his studio sale after his death on 7 May 1887 at the Hotel Drouot.
Eugène-Ernest Hillemacher (13 October 1818 – 3 March 1887) was a French painter. A portraitist and painter of history and genre, Hillemacher belonged to the so-called academic painting movement, between the July Monarchy, the Second Empire and the Third Republic.
WIKIPEDIA:https://fr.wikipedia.org/wiki/Eugène-Ernest_Hillemacher
It should be noted that E. Hillemacher's two sons were music composers, so the world of music and musicians is no stranger to him.
Size:each drawing 29x20 cmVintage oak frame 44x79 cm
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