Listen to III. Aria. Wer bist du? Frage dein Gewissen (Basso) online. III. Aria. Wer bist du? Frage dein Gewissen (Basso) is a German language song and is sung by Bas Ramselaar, Holland Boys Choir, Netherlands Bach Collegium and Pieter Jan Leusink. III. Aria. Wer bist du? Frage dein Gewissen (Basso), from the album J.S. Bach: Complete Sacred Cantatas Vol. 07, BWV 121-140, was released in the year 2013. The duration of the song is 2:35. Download German songs online from JioSaavn.