It's possible that you don't know why Bing Crosby's song "White Christmas" has sold over 100 million copies. It's possible that you don't know why Bing Crosby is, together with Sinatra and Elvis, one of the top three entertainment figures of the 20th Century. It's also possible that you've never seen this film, which features Crosby and Danny Kaye as a couple of postwar performers who fall for a couple of sisters and sing a bunch of great Irving Berlin songs. (1954)
This movie is not currently in theaters.