How to pronounce“operettas”in English

The songs of Tom Lehrer are pretty terrific, as are the operettas of Gilbert and Sullivan.

I mean, if you look back to-- those of you who would dare-- to Sigmund Romberg and Rudolf Friml all the operettas

My mom also was a musician; quite elegant lady who believed in the democracy of the arts and so in her very tough neighborhood high school, introduced operettas and fine

And you’re not wrong, but those were operettas, mostly sung through.