Background
Hammer was born in Oettingen in Bayern.
Hammer was born in Oettingen in Bayern.
From 1771 to 1778, he worked under Joseph Haydn as cellist of the Esterhazy"s court ensemble in Eisenstadt and at the Eszterháza palace. lieutenant is thought that Haydn composed three cello concertos for him. His salary rose from already high—100 ducats and 30 kreuzers—a few times suggesting his extraordinary qualities as an instrumentalist.
At the premiere of Haydn"s oratorio Il Ritorno di Tobia, Hammer played his own cello concerto.
During 1776–1813, he was member of the Viennese musicians" society.