A little added conjecture. By 1920 chanties and indeed sailing vessels were much more the province of Scandinavian, German and Polish seamen, but having sailed in British and American vessels they still knew and revered chanties in English or sometimes pigeon English. c1900 many merchant seamen learnt their trade aboard the remaining sailing vessels before graduating to steamers like SE. This was the case with some of he retired seamen I recorded in the 60s who had ended up in Hull, they learnt their trade aboard sailing vessels c1900-1910.