Assertion: opera's performance | /r/HasProperty | infrequent
Facets:
Source sentences:
text: Early performances of opera were too infrequent for singers to make a living exclusively from the style, but with the birth of commercial opera in the mid-17th century, professional performers began to emerge.
text: Due to the hectic nature of his career in the film industry, performances of Opera in Focus were infrequent, except for periods in 1962-1963 and 1978-1979 when Opera in Focus enjoyed residencies in Detroit and at the now-defunct Magic Pan restaurant in Chicago.