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 1923 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.
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|Work Title||Piano Quartet|
|Composer||Mason, Daniel Gregory|
|Opus/Catalogue NumberOp./Cat. No.||Op.7|
|I-Catalogue NumberI-Cat. No.||IDM 5|
|Year/Date of CompositionY/D of Comp.||1909–11|
|First Performance.||1914-15 or earlier (see below)|
|First Publication.||1917 – New York: Schirmer|
|Copyright Information||Possibly public domain in EU and other 70 pma territories.|
|Composer Time PeriodComp. Period||Early 20th century|
|Piece Style||Early 20th century|
|Instrumentation||Violin, viola, cello, piano|
1909 to 1911 according to Wikipedia. Dates may be from his memoirs "Adventures in Chamber Music", which one gathers describes his experiences (and "trials", according to Baron, "Chamber Music: A Research and Information Guide") writing his violin sonata and piano quartet.
Its New York premiere was planned for April 6 1915 according to an article in the New York Times, March 28 1915 (Members of the Kneisel Quartet, dedicatee playing piano); there is reference in theto earlier performances the same 1914-15 season by the same performers in Boston.