Wikipedia says Henri Casadesus died in 1947. That should make it PD. It also says
This concerto appeared in 1911 in a Russian edition, allegedly "transcribed...for small orchestra by Maximilian Steinberg,"...
I believe works published before 1927 are PD in the US. This should cover the case that it might not have been written by Casadesus. Piattidozen 22:46, 27 March 2010 (UTC)
I have added this text to the Handel concerto, and add it here, as well, for information's sake: This piece is listed as Baroque era, even though its composer was born in the mid-19th century. Why, then, is it in the Baroque listings?
Henri Casadesus was a member of the Society of Ancient Instruments, founded 1901, in which he played the Viola d'Amore. The Society was credited with rediscovering many works of the Baroque era, which they played and published. In reality, many of these pieces were written by Casadesus and his brothers, most notably Mario (who seems to have specialized in early Classical idioms.)
Henri specialized in Baroque idioms, and the two pieces here, Viola Concerto in the style of Handel and Viola Concerto in the style of CPE Bach were put forward as compositions of Handel and CPE Bach, respectively. They were actually written by Henri Casadesus. The pseudo-CPE Bach concerto was, in fact, in the early part of the 20th century, claimed to be the most often played and performed of CPE Bach's concertos! Tiorbinist 22:59, 8 January 2011 (UTC)