Listen to Treu sein online. Treu sein is a German language song and is sung by Bärbel Wachholz. Treu sein, from the album Schlager Cocktail (4 Original DDR Schlager Album - 1953 - 1962 64 Tracks), was released in the year 2015. The duration of the song is 2:30. Download German songs online from JioSaavn.