Rhapsody In Blue by George Gershwin, it's modern classical.
It is indeed!
OO oh hard one hmm i think it would be Mozart - Requiem in D minor but it a hard choice tho.
Eternity ~Memories of Light and Waves~ A nice piano piece, but it isn't traditionally classical
Liszt-paraphrase sur rigoletto
Beethoven's Moonlight Sonata, also Rachmaninov No 2 concerto
It depends - no one "favorite" fits every mood. A few I love for various occasions: Schubert's 8th symphony and his Am string quartet; Beethoven's Pathetique; Rachmaninoff's C#m prelude; some of Wagner's work, especially his overtures; Debussy's Syrinx... there are just too many to list, each one perfect for its own moment.
Rachmaninov Symphony no 2 in E minor.
Beethoven: Symphony No 7, 2nd movement.
I like Anton Schoenberg's "twelve-tone technique" work, Erik Satie's "Gnossienne No.1", the modern classical work of The Piano Guys, the movie music of Daniel Elfman (especially the soundtracks of "The Corpse Bride"), and also the game soundtracks of "Alice: Madness Returns", although I'm not sure those count as classical.
Night On Bare Mountain by Mussorgsky.
Arvo Part's Tabula Rosa.
Great question, by the way. Thanks for asking it. I will play the ones I don't know on YouTube and maybe they will become some of my favorites too.
Bagatelle No. 25 in A minor
That Omega watch theme song "Spring"