This varies widely from one orchestra to another and also depends on the particular piece being played.
4 usually.
Yes, it is. Lots of classical music is played by a symphony orchestra. There are thousands upon thousands of classical orchestral works - too many to list here.
classical
Specifically using the name "Classical Symphony"? Serge Prokofiev, who wrote it as a tribute to the classical era composers of the past.
Early classical to today!
5000
The 80's
The baroque concerto influenced the development of the classical symphony by introducing the idea of contrasting solo and orchestral sections, which later evolved into the classical symphonic form.
Yes and no, a symphony does have an alto sax sometimes but it is not required for it to have one. It really depends if the symphony is classical, blues, or jazz. Jazz and blues should always have an alto sax. Classical doesn't really need an alto sax, but it does make classical sound better.
A full symphony orchestra could easily have 80 people.
symphony
Try Beethoven's 6th Symphony.