Johan Peter Emilius Hartmann was, together with his son-in-law Niels W. Gade, the leading Danish composer of the 19th century, a period known as the Danish Golden Age. According to Alfred Einstein, he was "the real founder of the Romantic movement in Denmark and even in all Scandinavia". J.P.E. Hartmann was the third generation of composers in the Danish musical Hartmann family.

Musikforeningen in Copenhagen was Denmark's most important concert venue in the 19th century. It operated from 1838 to 1931 but it was especially under the leadership of Niels Gade (1850–90) that it became a meeting place for the city's music life with its own symphony orchestra and choir. Carl Nielsen was director from 1915–27. Other leaders included Franz Gläser, Emil Hartmann and Franz Neruda.