But the profane music of the day was often accompanied by a droning bass tone similar to that generated by the bourdon stop on an organ, which is provided in Corvus Corax's case by the drones on their bagpipes. An inkling as to the harmonies used is found in a song by Walter von der Vogelweide, in which he calls for the song to be played "the old way", meaning harmonising with thirds. At the time, the third was considered an awkward, ugly interval by the sacred musician — like the tritone, or diabolus in musica — but it was a common interval in folk music.