'''Symphony No. 70''' in D major, Hoboken 1/70, was written by Joseph Haydn to mark the start of construction of a new opera house on the Eszterháza estate. It was premiered on December 18, 1779 -- one of the few Haydn symphonies where the exact premiere date is known.Brown, A. Peter, ''The Symphonic Repertoire'' (Volume 2). Indiana University Press (ISBN 025333487X), pp. 176-178 (2002).