Johann Adam Hiller, German composer and conductor (died 1804)

Johann Adam Hiller was a German composer, conductor and writer on music, regarded as the creator of the Singspiel, an early form of German opera. In many of these operas he collaborated with the poet Christian Felix Weiße.

December 25 is the 359th day of the year in the Gregorian calendar; six days remain until the end of the year.