Her sister, Mary-Margaret O’Hara is a singer-songwriter. Catherine has written and performed songs in Christopher Guest’s film A Mighty Wind.

A criminally underrated but beloved star of film and television, the great Catherine O'Hara has been entertaining ... Neil Patrick Harris as Olaf. A Mighty Wind was Christopher Guest's third ...

The dry humor begins with Catherine O’Hara’s faded actress ... dog show-set Best in Show and A Mighty Wind which tackled folk music bands. That doesn’t make this comedy about the Oscars ...

A Mighty Wind, and For Your Consideration. Description above from the Wikipedia article Catherine O'Hara , licensed under CC-BY-SA, full list of contributors on Wikipedia.