Bing Crosby founds the first white Dixieland band in Birth of the Blues, a tuneful turn-of-the-century tale--if highly suspect as musical history. Borrowing hot licks from black musicians (Eddie "Rochester" Anderson comments, "Our music sure has gone highbrow"), Bing and his players struggle to invade the straight-laced clubs, succeeding only after songbird Mary Martin joins the band. Martin, in one of her infrequent movie appearances, has fun with Der Bingle jazzing up "Wait Till the Sun Shines, Nellie," a highlight of this breezily enjoyable nonsense. --Robert Horton