K.D. Lang is a Canadian singer-songwriter and multi-instrumentalist who has been active in the music industry since the 1980s. She is best known for her contralto vocal range and her work in both country and pop music. Her most successful single, 'Constant Craving', was released in 1992 and earned her a Grammy Award for Best Female Pop Vocal Performance. She has also won numerous Juno Awards and has been inducted into the Canadian Music Hall of Fame. Lang's first language is English, but she is also fluent in French, which is the four-letter answer to this crossword puzzle.