A Connecticut Yankee In King Arthur's Court (1949)

Based on the novel by Mark Twain, this adventure is about a man who travels back in time to Camelot after getting hit on the head. Because this version stars Bing Crosby there are, of course, lots of songs and singing.

After being thrown from his horse, an auto mechanic (Crosby) wakes up in medieval England, the prisoner of knight Sir Sagramore (William Bendix). He is taken to the court of an old King Arthur (Sir Cedric Hardwicke) where he escapes death by demonstrating some simple 20th century tricks like lighting a match. There he is knighted Sir Boss and starts a romance with Arthur's niece Alisande (Rhonda Fleming).

Available: Netflix, Amazon