Quarter centuries index for classical music?

[stefano_mbp]

… using tagUpdate file you could reach your goal, this is an example using Period tag :

@DATE=1754
+PERIOD=Late 1700
@DATE=1810
+PERIOD=Early 1800
@DATE=1820
+PERIOD=Early 1800
@DATE=1851
+PERIOD=Late 1800

and so on … it is a little bit tedious to set it up but once done it is forever, and with a little Excel skill you can do it easily and faster