Edited sentence: (2006) Liszt and his world.Friedriech 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.Gibbs, Christopher H.Princeton University Press.The famous virtuoso Franz Liszt, who played Graf pianos, must have been something of thorn in Herr Graf's side, as the Graf piano was not always capable of standing up to the violence that Liszt inflicted on it during his more impassioned moments of playing