E.g. The Merry Widow or Die Fledermaus (8)

I believe the answer is:

operetta

(Other definitions for operetta that I've seen before include "Eg, Orpheus in the Underworld" , "Eight dn, for instance" , "Light classical musical comedy-drama" , "Light musical theatre" , "Show" .)

I've seen this clue in The Guardian.

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