The ‘spirituality’ of this art, in which scholars have tried to find all the essentials of the later medieval conceptions of art, is in reality only … - Arnold Hauser

Early Christian art during the first two or three centuries of its existence was merely a development or even a variant of late Roman art. So great is the similarity between late pagan and early Christian work that the decisive change of style must have occurred between the classical and post-classical, not between the pagan and Christian eras.

The unity of the Middle Ages as a historical period is quite artificial. In reality they fall into three entirely distinct cultural periods—the natural economy of the early Middle Ages; the courtly chivalry of the high Middle Ages; and the urban bourgeois culture of the late Middle Ages. At any rate, the divisions between these three epochs go deeper than those which mark the beginning and the end of the Middle Ages as a whole.

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.