There are few, if any, good sources that give an impression of how Liszt really sounded from the 1820s. Carl Czerny claimed Liszt was a natural who played according to feeling, and reviews of his concerts especially praise the brilliance, strength and precision in his playing. At least one also mentions his ability to keep absolute tempo, which may be due to his father's insistence that he practice with a metronome.[citation needed] His repertoire at this time consisted primarily of pieces in the style of the brilliant Viennese school, such as concertos by Hummel and works by his former teacher Czerny, and his concerts often included a chance for the boy to display his prowess in improvisation. Franz Liszt Fantasizing at the Piano (1840), by Danhauser, commissioned by Conrad Graf. The imagined gathering shows seated Alfred de Musset or Alexandre Dumas, George Sand, Franz Liszt, Marie d'Agoult; standing Hector Berlioz or Victor Hugo, Niccolò Paganini, Gioachino Rossini; a bu! st of Beethoven on the grand piano (a "Graf"), a portrait of Lord Byron on the wall, a statue of Joan of Arc on the far left. Following the death of Liszt's father in 1827 and his hiatus from the life as a touring virtuoso, it is likely Liszt's playing gradually developed a more personal style. One of the most detailed descriptions of his playing from this time comes from the winter of 1831/1832, during which he was earning a living primarily as a teacher in Paris. Among his pupils was Valerie Boissier
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