Classical music is art music produced or rooted in the traditions of Western culture, including both liturgical (religious) and secular music.

The major time divisions of Western art music are as follows:

the ancient music period, before 500 AD
the early music period, which includes
the Medieval (500–1400) including
the ars antiqua (1170–1310)
the ars nova (1310–1377)
the ars subtilior (1360–1420)
the Renaissance (1400–1600) eras.
Baroque (1600–1750)
the galant music period (1720s–1770s)
the common-practice period, which includes
Baroque (1600–1750)
the galant music period (1720s–1770s)
Classical (1750–1820)
Romantic eras (c.1780–1910)
the 20th and 21st centuries (1901–present) which includes:
the modern (1890–1930) that overlaps from the late-19th century,
impressionism (1875 or 1890–1925) that also overlaps from the late-19th century
neoclassicism (1920–1950), predominantly in the inter-war period
the high modern (1930–present)
the postmodern (1930–present) eras
the experimental (1950–present)
contemporary (1945 or 1975–present)