It is very unlikely that this work is public domain in the EU, or in any country where the copyright term is life-plus-70 years. However, it is in the public domain in Canada (where IMSLP is hosted) and other countries where the term is life-plus-50 years (such as China, Japan, Korea and many others worldwide). As this work was first published before 1926 or failed to meet notice or renewal requirements to secure statutory copyright with no "restoration" under the GATT amendments, it is very likely to be public domain in the USA as well.
|Genre Categories||; ; ; ; ;; ; ;|
|Work Title||Cello Concerto|
|Opus/Catalogue NumberOp./Cat. No.||Op.20|
|I-Catalogue NumberI-Cat. No.||IRJ 1|
|Dedication||Monsieur Jules Loëb, professeur au Conservatoire de Paris|
|Composer Time PeriodComp. Period||Early 20th century|
Little mention is made of René Jullien, other than he was cellist in the Lejeune quartet before and after WW1 with Nestor Lejeune, first violin, Gaston Tinlot second violin, and Jean Lefranc viola.
Piano score is presumably a reduction. Worldcat says "violoncelle et orchestre de brasserie"- perhaps the original accompaniment is for brass orchestra?
Actually, an "orchestre de brasserie" in those days, around WW1, designated a small mixed orchestra, that performed in public places (not necessarily "alehouses" (="brasseries"), any place distinct from concert halls. The following article, in French and badly reproduced, attempts to clarify the issue : http://lmhsbd.oicrm.org/media/ART-BEGa-1923-01.pdf