Along with Camille Saint-Saëns, Casadesus founded the "Société des instruments anciens" in 1901. The society, which operated between 1901 and 1939, was a quintet of performers who used obsolete instruments such as the viola da gamba, or Casadesus's own instrument, the viola d'amore.
The quintet was also notable in its day for premiering rediscovered works by long-dead composers. It was later discovered that Casadesus and his brothers, notably Marius Casadesus, wrote these works. The Adélaïde Concerto, allegedly by Wolfgang Amadeus Mozart, is sometimes mistakenly attributed to Henri but is actually by Marius.
However, Casadesus is believed to have been the author of a "Concerto in D Major for viola" ascribed to Carl Philipp Emanuel Bach, described by Rachel W. Wade in her survey The Keyboard Concertos of Carl Philipp Emanuel Bach. This concerto appeared in 1911 in a Russian edition, allegedly "transcribed...for small orchestra by Maximilian Steinberg," and was subsequently performed by conductors such as Darius Milhaud and Serge Koussevitsky, then recorded by both Felix Prohaska and Eugene Ormandy, all under the false attribution. "Thus," Wade wrote in 1981, "at the present time, the most frequently recorded concerto of C.P.E. Bach is a spurious one."[2]
Casadesus is also credited with the "Handel Concerto" and the "J.C. Bach Concerto," which are both for viola as well. These are often referred to as "The Handel/Casadesus Concerto" and "The J.C. Bach/Casadesus Concerto". Scholarly criticism has confirmed that both these concerti were written by Henri Casadesus in the style of their purported composers. Casadesus is also the composer of a violin concerto in D major in the style of Boccherini.[3]
Le rosier, Opera buffa in 3 acts (1914); libretto by Maurice Devilliers
Les plaisirs champêtres, ou, Les tentations de las bergère et l'amour vainqueur, Ballet in 1 act (1924); music derived from Plaisirs champêtres and Divertissement by Michel Pignolet de Montéclair
Cotillon III, Opera buffa in 3 acts (1927); libretto by Gabriel Alphaud and Pierre Maudru
Sans tambour ni trompette, Operetta in 3 acts, 4 scenes (1931); libretto by Pierre Veber and Henry de Gorsse
Valses de France, Fantasie musicale et grand spectacle "Sur des airs célèbres de Gounod, G. Bizet, B. Godard, L. Delibes, Hervé, O. Métra, Lacome, P. Delmet" in 2 acts, 18 scenes (1943); libretto by Eddy Ghilain [fr] and Albert Willemetz
La petite-fille de madame Angot, Operetta
Orchestral
Concerto in D major for small orchestra (ca.1905, published 1912); original "for four viols concertante"; falsely attributed to Carl Philipp Emanuel Bach
Divertissement bressan, Suite for orchestra (published 1943)
Divertissement Provençal, Suite for orchestra (published 1943)
Cortège et danse des treilles
L'Erbeto di frisoun
Le pas du cap de juven
Tambourin
Concertante
Concerto (Suite) in D major for violin or viola and piano or orchestra (ca.1905, published 1931); original "for four viols concertante"; falsely attributed to Carl Philipp Emanuel Bach
"Handel" Concerto in B minor for viola and orchestra (published 1924); falsely attributed to George Frideric Handel
"J.C. Bach" Concerto in C minor for viola and orchestra (published 1947); falsely attributed to Johann Christian Bach
Chamber music
Aria de la Suite en sol, for cello and piano (or organ) (1911)[4]
Suite for string quartet (or string orchestra) (published 1931); falsely attributed to Carl Philipp Emanuel Bach
La ronde des saisons for woodwind quintet (published 1987)
24 préludes pour viole d'amour avec accompagnement de clavecin, piano ou harpe (24 Preludes) for viola d'amore with accompaniment of harpsichord, piano, or harp (1931)
Pedagogical works
Technique de la viole d'amour (Technique of the Viola d'amore) (1931)
Piano
Pieces from Cotillon-jazz (1927)
C'est moi, One-step
Jeux innocents, Fox-trot
Loulou, Fox-trot
Radix, One-step
Marche ternaire (1935)
Le jardin des amours (1939)
Pavane
Passepied
Menuet tendre
Canarie
Les Récréations de la campagne (1947)
Vocal
Quatre chansons cambodgiennes (4 Cambodian Songs) for voice and piano (1931); French words by Fernand Rouvray
Quatre chansons françaises (4 French Songs) for voice and piano (1933); words by Léon Guillot de Saix
Normandie for voice and piano (1935); words by René Dorin