During the later half of the eighteenth century the pianoforte gradually superseded the older clavichord. With the rapid improvements in piano-making, piano playing and composing became more and more artistic. Haydn, Mozart and Clementi were influenced at first by the clavier style of Emanuel Bach, but soon developed new features in their piano works. Clementi, especially, carried technique to a point beyond others of his time. His celebrated studies, “Gradus ad Parnassum,” are indispensable in the training of pianists. [Illustration: JOHANN LUDWIG DUSSEK. Portrait from a bust by Callamard, engraved by Quenedey. ] Mozart brought the piano concerto into prominence, and set the example followed by Beethoven and others in this form. The concertos of Mozart are his chief compositions for the pianoforte. The best of them have a place beside his last symphonies and string quartets. The grace and elegance of his piano style, and the perfect balance between the solo instrument and the orchestra, render his concertos models of form and beauty. Among the contemporaries and followers of Mozart and Clementi in this branch were Steibelt (176 –1823), Sterkel (1750–1817), Kozeluch (1753–1814), Hässler (1747–1822), Gelinde (1757–1825), Dussek, Woelfl, Hummel, Cramer and Field. Johann Ludwig Dussek (1760–1872) was a brilliant representative of the piano style, who showed originality in his modulations and use of dissonances. There is a certain romantic feeling that characterizes his best piano compositions, as for instance, his “La Consolation” and “La Chasse.” Joseph Woelfl (1772–1812) had a brilliant career as a piano virtuoso. He visited Paris and London and other cities, where his playing created great astonishment. At Vienna he met Beethoven (in his younger days) as a friendly rival in extemporaneous playing. Notwithstanding the partisan feeling among their audiences, personally they appeared to have a mutual respect for each other. Though Woelfl had greater execution and equal facility in improvising, Beethoven excelled him and all others in imagination and inspiration, in the power of moving the feelings of his listeners. Woelfl was noted for his breadth of style, as well as his breadth of hand-grasp; with his enormous hands he could cover two thirds of the key-board.