Joseph M. Schwarz was a Russian-born German baritone. He pursued a performance career against the wishes of his parents, running away from home as a teenager to join a band of traveling minstrels. He later trained at the Vienna Conservatory and had an active international performance career in operas and concerts during the first quarter of the twentieth century.

Olga von Türk-Rohn, also known by her title through marriage as Baroness von Türk-Rohn and by her maiden name Olga von Rohn, was an Austrian soprano and voice teacher. She began her career as a concert soprano in 1887 and then worked as an opera singer in Graz from 1888 to 1890. She also sang in one opera with the Vienna State Opera before her marriage to Baron Camillo von Türk in either 1891 or 1897.