Question: Laura Don's son wrote a libretto for an operetta composed by which conductor?
Sentence (from "Babes in Toyland (operetta)"): Babes in Toyland is an operetta composed by Victor Herbert with a libretto by Glen MacDonough (1870–1924), which wove together various characters from Mother Goose nursery rhymes into a Christmas-themed musical extravaganza.
Relevant evidence: Yes