This is a case of a song being written for a particular show but takes on a life of its own thanks to a popular cover. Here's the background on the song and its original appearance in a 1964 musical. Nina Simone's version recorded in 1965 became a big hit and has appeared in numerous places. But I would venture to bet that most people know this version by Michael Buble the best. The video is a pure classic as well. Enjoy.