Friedrich Wieck book he published some studies and exercises for the piano, a number of pamphlets, and edited various piano works. A turning point came in Wieck's life when Clara and Robert Schumann fell in love. Fearing that her marriage to an impecunious composer would destroy the plans he had for her music career, he opposed their union in every way he could. He threatened to shoot Robert. The young lovers resorted to clandestine meetings and letter-writing. Because Clara was not yet of age, her father's consent was required before they could marry. Not receiving his consent, they applied to the Saxon
Conrad Graf of standing up to the violence that Liszt inflicted on it during his more impassioned moments of playing. Friedrich Wieck wrote in his diary in during Liszt's 1838 visit to Vienna, "We heard Liszt today at Conrad Graf's who was sweating as his piano did not survive the great duel—Liszt remained the victor." Wieck described another concert on the same visit in which Liszt "destroyed" two Grafs, as well as an Erard piano lent to him by Sigismond Thalberg. In 1840, Graf gave one of his firm's grand pianos as a gift to the young piano virtuoso Clara Wieck (Friedrich's