Ravel

Tchaikovsky

Brahms

Saint -Saens

Rachmaninoff

and Chopin finishes just out of the top five.

Mussorgsky
Smetana
Debussy
Holst
Tartini/Saint-Saens

Probably in that order...

Mozart
Debussy
Bartók
Tchaikovsky
Burgmüller

in no particular order. And so many more! It was hard to pick just 5.

Top Three:
Faure
Mahler
Beethoven

Vivaldi is my favorite, the rest are in no particular order.

Vivaldi
Gershwin (he counts right?)
Chopin
Verdi
Tchaikovsky

Vivaldi is up there along with Mozart.
And burn me at the stake for herecy, but the classical work of alot of modern composers pushes up past composers like Chopin for me. Even full orchestrals by Nobuo Uemetsu, the music director of the Final Fantasy series. The music itself may not be up to par with the early classical composers, but when you put it in the context of the story and message it is trying to portray, you would struggle to find any artist that can compete.

In no particular order
Chopin (for being cool, and composing songs like winter wind and the ocean)
Mozart(some of the most memorable songs)
Tchaikovsky(badass bro)
Brahms
Beethoven (even the ice cream man plays his songs)

and if I could squeeze in a sixth bro, it would be dvorak, because his music is so dramatic.

Grieg
Tchaikovsky
Wagner
Debussy
Chopin

Gershwin counts for me ;)
Bach
Prokofiev
Bartok

(not in any order)

bach
maller
chopin
grieg
beethoven