Kraus also published some songs with Jörg Maria Berg; under the pseudonym The James Brothers; the two played German cover versions "Wenn" (When) in 1958, "Cowboy Billy" ("Don't Take Your Guns to Town") in 1959, "Rote Rosen" (Pretty Blue Eyes) in 1960, "Die jungen Jahre" (Endless Sleep) and "Hätt' ich einen Hammer" (If I Had a Hammer) in 1964, to name a few. He also sang duets with Connie Francis, Lill Babs, Danny Mann, Alice and Ellen Kessler, Gus Backus and Gina Dobra.