Berthe Marx-Goldschmidt was allegedly (#06625) the illegitimate daughter of violinist, conductor and concert impressario Charles Lamoureux (1834-1899).
Marx-Goldschmidt was a musician, and played in concerts with the violinist Pablo de Sarasate. She is referred to in JW's correspondence in the early 1890s. They may have met in Paris.
www.musikerbriefe.at/schrift.asp?Nr=3837 (accessed 2004.6).