But the young girl's gifts were so extraordinary, and withal her character so full of childish simplicity and gayety, that it was difficult to think of her as of the average child phenomenon. At the age of nine she could play Mozart's concertos, and Hummel's A minor Concerto for the orchestra, one of the most difficult of compositions. A year later she began to compose, and improvised without difficulty, for her lessons in counterpoint and harmony had kept pace with her studies of pianoforte technique. Paganini visited Leipzig at this period, and was so astonished at the little Clara's precocious genius that he insisted on her presence at all his concerts, and addressed her with the deepest respect as a fellow-artist. She first appeared in public concert at the age of eleven, in Leipzig, Weimar, and other places, playing Pixis, Moscheles, Mendelssohn, Beethoven, and Chopin. The latter of these composers was then almost unknown in Germany, and Clara Wieck, young as she was, contributed largely to making him popular. A year later she visited Paris in company with her father, and heard Chopin, Liszt, and Kalkbrenner, who on their part were delighted with the little artist, who, beneath the delicacy and timidity of the child, indicated extraordinary powers. Society received her with the most flattering approbation, and when her father allowed her to appear in concert her playing excited the greatest delight and surprise. Her improvisation specially displayed a vigor of imagination, a fine artistic taste, and a well-defined knowledge which justly called out the most enthusiastic recognition. When Clara Wieck returned home, she gave herself up to work with fresh ardor, studying composition under Heinrich Dorn, singing under the celebrated Mieksch, and even violin-playing, so great was her ambition for musical accomplishments. From 1836 to 1838 she made an extended musical tour through Germany, and was welcomed as a musico-poetic ideal by the enthusiasts who gathered around her. The poet Grillparzer spoke of her as "the innocent child who first unlocked the casket in which Beethoven buried his mighty heart," and it must be confessed that Clara Wieck, even as a young girl, did more than any other pianist to develop a love of and appreciation for the music of the Titan of composers.