- Enter 17, 18 or 19 to return all the concerts (by year) in that century
- For 18 and 19 you can enter a third or fourth number to refine your search.
- Entering 183 will return all concerts given in the years 1830-1839
- Entering 1954 will return all concerts given in the year 1954
- Enter 0 to return concerts where the date is unknown
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