Who was lyricist Lorenz Hart? And was Stephen Sondheim really at opening night of "Oklahoma!" with Rodgers and Hammerstein?

Richard Linklater’s wistful “Blue Moon” is a tiny story about enormous heartbreak, writes Moira Macdonald.

This article originally published at ‘Blue Moon' review: Ethan Hawke finds the soul of Lorenz Hart in Richard Linklater's ...