In 1963, Davis achieved her biggest success with country pop crossover hit "The End of the World". The song just missed topping the country and pop charts that year; however, it did top the adult contemporary charts. The record was also a surprise top-five hit on the rhythm and blues charts, making Davis one of the few white female singers to have a top-10 hit in that market. The single sold over one million copies, and was awarded a gold disc. This song was likely the first popular example of Sound on Sound where the erase magnet was disabled and the artist sang along with the recording or the original recording was mixed with the live artist voice and re-recorded, Therefore, it sounds like a duet in places. "The End of the World" soon became Davis's signature song. Davis achieved one other country-pop hit with the Gerry Goffin and Carole King-penned "I Can't Stay Mad at You", which peaked at number seven on the pop charts and number two on the Easy Listening chart in 1963. In 1964, after four years of marriage, Davis divorced Emery after finding he had been unfaithful to her, and conceived a child with another woman. The same year, she was nominated for a Grammy Award for Best Female Country Vocal Performance for her recording of "He Says the Same Things to Me."