Mozart - Sinfonia Concertante for Violin, Viola and Orchestra in E-flat major, K. 364 (320d)
1:24 to 2:16 (shame that Rachel Podger, Pavlo Beznosiuk, Orchestra of the Age of Enlightenment recording isn't on youtube where it's even more powerful)
The mannheim crescendo with ascending pitch to the intense forte syncopated one note melody in the violins as the trill motive alternates on the viola and cello and then the brilliant sudden quiet as the violin plays the descending stepwise melodies that subsequently alternate with the woodwinds.
The release of the buildup is just transcendental. Like a person gaining knowledge (during the crescendo) reaching euphoria and joy ( the syncopated part) then peaceful transcendence
I have just been replaying that section repeatedly. The rest of the concerto could suck and I would still think it's a great concerto