Gustav Mahler was an 19th and 20th Century Bohemian-Austrian Human composer. Among his works, The Symphony No. 1 in D major by Gustav Mahler, also known by its nickname "The Titan", was written in the 1880s.
Mahler's Symphony Number One was played on the ship-wide comm when Kashyk came aboard Voyager in 2375. (VOY: "Counterpoint")