So the experience of an orchestra is different from that of its audience... and the prelude to a performance of Strauss' Ein Heldenleben with a Beecham or a Karajan is very different from that preceding a concert which includes Mozart's G Minor Symphony with a Menuhin or a Monteux. It must be remembered, also, that the sudden revelation at the start of either of these concerts is no revelation at all for the members of the orchestra. They have rehearsed this performance...