"Classical music is a broad term that usually refers to music produced in, or rooted in the traditions of Western ecclesiastical and concert music, encompassing a broad period from roughly the 9th century to present times. The central norms of this tradition became codified between 1550 and 1900, which is known as the common practice period"
The common practice periold basically means: Baroque (1600 – 1760)
Classical (1730 – 1820)
Romantic (1815 – 1910)