Armstrongs´s Patent is an enthusiastic group of men, who are specialised in singing maritime folk, shanties and sea shanties. They sing shanties a cappella with a choir leader and songs of the sea. The songs fromArmstrong´s Patent come from the golden age of sail. They were sung on board of clippers, whalers and ferry ships. Each sailing ship branch knew his own specific songs. Appingedam is homeport of Armstrong´s Patent.