His huge repertoire included 85 operas and 30 operettas .
Davydov , the most popular male Russian singer of his generation , made about 400 gramophone recordings in 1901 - 1912 .
Davydov 's huge repertoire included 85 operas and 30 operettas .
Davydov , the most popular male Russian singer of his generation , made about 400 gramophone recordings in 1901 - 1912 .