What do you know about classical music? I enjoy listening to the symphony in my hometown, but I am clueless about it.
I believe Classical music is art music produced or rooted in the traditions of Western culture.It is very secular.
Is it very secular? It seems like I have heard a lot of Christian based classical music.
A more precise term is also used to refer to the period from 1750 to 1820.It is known as the Classical period. 
Oh I see. Maybe I am considering too broad of a term.
Some interpretations can leave less room for practices such as improvisation and "ad libitum" ornamentation.That is common on in non-European art music.
Is that improvisation like Jazz?
Most popular styles like jazz most popular styles adopt the song (strophic) form or a derivation of this form
What do you mean by strophic form?
That term is very complex.It means that classical music has been noted for its development of highly sophisticated forms of instrumental music such as the symphony, concerto, fugue, sonata, and mixed vocal and instrumental styles such as opera, cantata, and mass