mahler 2nd symphony, in the middle of the 1st movement, before the return of the opening themenothing can beat that, surely!
how about rach 3rd concerto climaxes?
Scrabin; 4th sonata at the end of the 2nd movement.
Also I rather like Respighi's "The Pines of Rome" at the end as the victorious legions march imperiously down the Appian Way and into Rome in glorious procession.
or, the ending of mussorgsky's 'pics at an exhibition.' i think it's the only piece that i've been highly excited by. of course, it was the 1985? tchaikovsky competition with barry douglas playing it.
Surely, the biggest climax is from Ravel's Bolero.
Prokofiev - Piano Concerto #2, Mvt. 1 Cadenza - Orchestra reentry
Rach 3 cadenza in first movement...
The Wagner-Liszt-Tristan & Isolde is one huge musical orgasm.
And the Wittgenstien transcription of it for left hand alone is - oh, never mind...Best,Alistair