Mozart, Beethoven, and Beethoven

I found myself at the Conservatory again recently to hear two more quartets (Mozart's 'Dissonance' and Beethoven's Opus 18 #4), and Beethoven's 'Archduke' piano trio, Opus 97. I confess that, to my 21st century ears, the intro to the first movement of the Mozart was hard to hear as shocking dissonance or atonality (the way it was apparently heard in the 18th century, according to one of the players, who introduced the piece). But the Mozart was good preparation for the Opus 18 quartet, about which the first violin said, "Beethoven is in the wrong clothes in this piece --- he's in Mozart's clothes, and he's trying to get out!" And Beethoven got all the way out in the trio, of course. Since the pianist was playing a modern concert grand, I thought that the lid should have been down --- the piano overwhelmed the strings from time to time, which a fortepiano would not have done. But I was swept along in any case, by this wonderful piece.