Appletons' Cyclopædia of American Biography/Hagen, Theodore
HAGEN, Theodore, musician, b. in Hamburg, Germany, 15 April, 1823; d. in New York city, 27 Dec., 1871. He studied music in his native city and in Paris; in the latter city from 1841 till 1843. Soon after his return to Germany he became known as a writer on musical topics, especially as a contributor to Schumann's “Neue Zeitschrift für Musik” and as the author of a book entitled, in its English translation, “Civilization and Music.” He came to New York in 1854, and assumed the editorship of the “Musical Gazette,” which was at the end of about six months consolidated with another journal under the title of the “New York Musical Review and Gazette,” of which in 1862 he became both editor and proprietor. Besides the work mentioned above he wrote “Musical Novels” (1848).