In Vienna in 1819 the violinist Joseph Böhm assembled a string quartet, and Holz – a civil servant in the Austrian government by profession – joined as second violin. In 1823 the violinist Ignaz Schuppanzigh returned to the city after several years away. He had formed a string quartet in Vienna in the 1790s; he was a friend of Beethoven and had given the first performance of the composer's first set of string quartets Op. 18. Böhm's quartet disbanded, and Holz joined Schuppanzigh's reformed quartet. In 1824 Beethoven, who had not written a string quartet since his Op. 95 in 1810, began work on a commission from Prince Nicholas Galitzin to write three string quartets. The first of these, the String Quartet Op. 127, was given its first performance by Schuppanzigh's quartet the following year. The quartet later performed the other two works commissioned, the String Quartet Op. 130 and String Quartet Op. 132.
Beethoven's secretary
While Holz was working as one of Beethoven's copyists, the composer fired his current secretary Anton Schindler and Holz became Beethoven's secretary in 1825. Letters to Holz and entries in Beethoven's conversation books show that Holz was a devoted admirer, and of great help to the composer. Beethoven reconciled with Schindler in 1826; Schindler returned to assist Holz with managing Beethoven's affairs. Some years later, Holz talked to the music scholar Ludwig Nohl about the composer during the time of writing the late quartets: "While composing the three quartets requested by Prince Galitzin, such a wealth of new quartet ideas flowed from Beethoven's inexhaustible imagination that he virtually had to write the Quartets in C-Sharp Minor and F Major involuntarily. 'My dear fellow, I've just had another idea,' he would say jocularly and with glistening eyes when we were out walking, and would write down a few notes in his sketchbook." Also as told to Ludwig Nohl, Holz said, "For him the crowning achievement of his quartet writing, and his favourite piece, was the E-Flat Cavatina in 3/4 time from the Quartet in B-Flat Major. He actually composed it in tears of melancholy and confessed to me that his own music had never had such an effect on him before, and that even thinking back to that piece cost him fresh tears."
After Beethoven
In 1829 he became a director of the Concerts Spirituels, a series of concerts in Vienna, which had been established in 1819. As director, Holz frequently programmed works of Beethoven in the concerts. After Ignaz Schuppanzigh's death in 1830, Leopold Jansa, a violinist and composer, formed a string quartet with Holz and another member of Schuppanzigh's quartet, the cellist Josef Linke.
