Ina Santhagens-Waller
Santhagens-Waller sang in her early career in 1913 as a solo singer in churches, including in Haarlem and The Hague. Later in 1913 she started giving concerts together with violinist Joyce Haworth led by . Their first concert was on 8 November 1913 in Hilversum, at the time also with singer . Next concerts with Haworth and Cornelis followed in February 1914 at "De Kroon" in Haarlem and in Nijmegen on 1 April 1914. In 1917 she gave multiple solo concerts, led by Marga Klatte, in Haarlem and Breda. Criticism has been written about her solo performances. In 1919 she gave a solo concert together with cellist F. Canivez led by  on the piano. The same year, she was also a singer of the opara Giovanna d'Arco in Amsterdam. In January she gave a solo concert led by J. Otten-van Warmelo. She continued to perform led by Otten-van Warmelo during readings of artist Richard Roland Holst in March and April. Santhagens-Waller was for years a mistress of Holst.