"The fundamental difference between composing for a nobleman or a personal patron in general and working for the anonymous concert public is that the commissioned work is usually intended for a single performance, whereas the concert piece is written for as many repeats as possible. That explains not only the greater degree of care with which such a work is often composed but also the more exacting way in which the composer presents it. Now that it is possible to create works which would not be consigned to oblivion so quickly as commissioned works, he 76 sets out to create ‘immortal’ works. Haydn already composes much more cautiously and slowly than his predecessors. But even he writes over a hundred symphonies; Mozart writes only half as many and Beethoven only nine."