Ivan Rebroff was a German-born vocalist, allegedly of Russian ancestry, who rose to prominence for his distinct and extensive vocal range of four octaves, ranging "from a low F to a high F, one and a quarter octaves above C". An imposing figure on stage, usually bearded and dressed in Cossack clothing, his presence was enhanced by his height, being over 2 metres tall. support.google.com/youtube?p=sub_to_oac
