The art most significantly affected by radio was music, since it was abolished the acoustic or mechanical limitations on the range of sounds. Music, … - Eric Hobsbawm

Marx's ideas became the doctrines inspiring the labour and socialist movements of most of Europe. Mainly via Lenin and the Russian Revolution they became the quintessential international doctrine of twentieth-century social revolution, equally welcomes as such from China to Peru. Through the triumph of parties identified with these doctrines, versions of these ideas became the official ideology of the states in which, at their peak, something like a third of the human race lived, not to mention political movements of varying size an importance in the rest of the world. The only individually identifiable thinkers who have achieved comparable status are the founders of the great religions in the past, and with the possible exception of Muhammad none have triumphed on a comparable scale with such rapidity. No secular thinker can be named beside him in this respect.

In short, on the questions with which historical research and theoretical reaction can deal, there was and could be no difference in substance between scholars for whom the identity problems of Civitella were insignificant or uninteresting and a historian for whom they were existentially central. All historians present hoped to agree about the formulation of the questions about the Nazi atrocities, though one would not necessarily expect them to agree about them. All agreed about the procedures for answering these questions, the nature of the possible evidence which would allow them to be answered - insofar as the answers depended on evidence - and about the comparability of events which were experienced by the participants as unique and incommunicable. Conversely, those who were unwilling to submit their, or their community's, experience to these procedures, or who refused to accept the results of such tests, were outside the discipline of history, however much historians respected their motives and feelings. In fact, among the historians present there was an impressive consensus on matters of substance. It contrasted strikingly with the chaos of varied and conflicting emotions which agitated the participants.

So let me conclude. History has made progress this century, in a lumbering and zig-zag manner, but genuine progress. In saying this I am implying that it belongs to the disciplines to which the word 'progress' can properly apply, that it is possible to arrive at a better understanding of a process which is objective and real, namely the complex, contradictory, but not adventitious, historical development of human societies in the world. I know that there are people who deny this.