My suggestions are:
a) stylistical era (medieval-renaissance-baroque-classicism-19th
century-20th century)
b) date of birth
c) century/date of birth
d) genres/sub-genres: opera/opereta - religious
(mass/oratorio/cantata/motet/...) - non religious vocal
(oratorio/cantata/motet/choral/lied/...) - ochestral music - chamber
music - solo music
My database is styliscal era.
Edson Ortolan
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