Dates of classical music eras
Music historians divide the European classical music repertory into various eras based on what style was most popular as taste changed. These eras and styles include Medieval, Renaissance, Baroque, Classical, Romantic, and 20th century. Some of the terms, such as "Renaissance" and "Baroque", are borrowed from Western art history. Approximate dates can be assigned to the beginning and ending of each of these eras, which can be useful in describing changes in taste and to estimate the style of a work composed in a particular year. However, these dates are approximate and even good approximations are hard to make.
Problems inherent in assigning date ranges
Picking particular years for the beginning and end points of eras in European classical music is difficult for several reasons. First, these eras began and ended at different times in different locations. Second, works of particular styles can be found that were composed after the style was no longer popular or important. Third, the styles themselves overlap and absolute categorization is not possible in all cases. For example, a "late Renaissance" piece would likely be very similar to an "early Baroque" piece. 
Date ranges of classical music eras are therefore somewhat arbitrary, and are only intended as approximate guides. Scholars of music history do not agree on the start and end dates, and in many cases disagree whether particular years should be chosen at all.
Graphical representation of commonly accepted dates
The following graph depicts commonly accepted dates for major movements in classical music.
Not shown on the chart:
- Prehistoric music encompasses that music which existed prior to any historical record.
- Ancient music extended from approximately 1500 B.C. until the fall of Rome in 476 A.D.
- Grout. A History of Western Music. p. 172.
- Carter. Seventeenth Century Music. p. 1.
- Carter, Tim (2005). "Renaissance, Mannerism, Baroque". The Cambridge History of Seventeenth Century Music. Cambridge University Press. pp. 1–3. ISBN 978-0-521-79273-8.
- Grout, Donald Jay (1973). A History of Western Music (Revised ed.). New York: W. W. Norton. ISBN 0-393-09416-2.
- "History of Classical Music". Naxos.Com Introduction to Classical Music. Hong Kong: Naxos Digital Services Ltd. Retrieved 2 January 2009.