Stephen Vost Janssen (or Vost-Janssen; November[1] 1879[1]/1880,[2] Newcastle-Upon-Tyne,[3][2] England – March/April 1945[4] Sydney,[4][2] Australia) was an Australian violin and viola player, teacher and composer, member of the Sydney String Quartet and Austral String Quartet.
In 1903 at a Sydney College of Music examination he received a silver medal as first prize for an original piano composition (Romance in F).
The farewell concert was held in Newcastle King's Hall and included some compositions of his own: the above-mentioned piano Romance and The Lifeboat (a song).
Returning to England, Vost Janssen became a member of the John Dunn's String Quartet.
[12] While in Europe he published two articles in his native Newcastle newspaper describing musical life in England and Leipzig.
One of his pupils from this period was David Burt, who on his insistence went to Germany in spring 1908[13] to study at the Leipzig Concervatorium.
In November 1911 the violinist Francis Mowat-Carter went to Europe,[20] what meant a loss of one of the most active musical life organizers.
For some time Vost Janssen was conductor of the Newcastle Operatic Society, but resigned this position during 1912–1913 season.