The rapidity with which he composed songs was incredible. October, 1815, he finds the poems of Rosegarten, and between the 15th and 19th sets seven of them. "Everything that he touched," says Schumann, "turned into music." At a later date, calling upon one of his friends, he found certain poems by Wilhelm Mueller, and carried them off with him. A few days later, his friend desiring the book, called on Schubert for it, and found that he had already set a number of them to music. They were the songs of the "_Schoene Muellerin_." A year or so after, returning from a day in the country, they stopped at a tavern, where he found a friend with a volume of Shakespeare open before him. Schubert took up the volume, turned a few pages, became interested in one of the pieces, took up some waste paper, and scribbling the lines proceeded to write a melody. This was the so-called "Shakespeare Serenade," "Hark, Hark, the Lark." The "Serenade," in D minor, is said to have been conceived in a similarly impromptu manner. In 1816 the great tenor, Vogl, made Schubert's acquaintance, having been brought by one of Schubert's admirers. At first the songs did not make much impression upon him; later they grew upon him, and he introduced them among the best circles of the Vienna aristocracy. Vogl appreciated the value of these songs. "Nothing," said he, "so shows the want of a good school of singing as Schubert's songs. Otherwise, what an enormous and universal effect must have been produced throughout the world, wherever the German language is understood, by these truly divine inspirations, these utterances of musical clairvoyance. How many would have comprehended for the first time the meaning of such terms as speech and poetry in music; words in harmony, ideas clothed in music, and would have learned that the finest poems of our greatest poets may be enhanced and even transcended when translated into musical language. Numberless examples might be named, but I will only mention the 'Erl King,' 'Gretchen,' '_Schwager Kronos_,' 'The Mignon's and Harper's Songs,' 'Schiller's Pilgrim,' the '_Burgschaft_' and the '_Sehnsucht_.'"