Please answer the following question: Given the following context:  In 1898 the RCM offered Holst a further year's scholarship, but he felt that he had learned as much as he could there and that it was time, as he put it, to "learn by doing". Some of his compositions were published and performed; the previous year The Times had praised his song "Light Leaves Whisper", "a moderately elaborate composition in six parts, treated with a good deal of expression and poetic feeling".Occasional successes notwithstanding, Holst found that "man cannot live by composition alone"; he took posts as organist at various London churches, and continued playing the trombone in theatre orchestras. In 1898 he was appointed first trombonist and répétiteur with the Carl Rosa Opera Company and toured with the Scottish Orchestra. Though a capable rather than a virtuoso player he won the praise of the leading conductor Hans Richter, for whom he played at Covent Garden. His salary was only just enough to live on, and he supplemented it by playing in a popular orchestra called the "White Viennese Band", conducted by Stanislas Wurm.Holst enjoyed playing for Wurm, and learned much from him about drawing rubato from players. Nevertheless, longing to devote his time to composing, Holst found the necessity of playing for "the Worm" or any other light orchestra "a wicked and loathsome waste of time". Vaughan Williams did not altogether agree with his friend about this; he admitted that some of the music was "trashy" but thought it had been useful to Holst nonetheless: "To start with, the very worst a trombonist has to put up with is as nothing compared to what a church organist has to endure; and secondly, Holst is above all an orchestral composer, and that sure touch which distinguishes his orchestral writing is due largely to the fact that he has been an orchestral player; he has learnt his art, both technically and in substance, not at second hand from text books and models, but from actual live experience."With a modest income secured, Holst was able to marry Isobel; the ceremony was at Fulham Register...  answer the following question:  What is the name of the person who supplemented his salary by playing in a popular orchestra called the "White Viennese Band"?
Answer:
Holst