If you've seen Butch Cassidy and The Sundance Kid, you know this song comes as a jarring and unexpected but pleasant surprise in that movie. If you haven't, you might be surprised to learn that this song was written for a movie, by the famed songwriting team Burt Bacharach and Hal David. It would be the first of many Number 1 hits for B.J. Thomas as well.
It's justifiably considered one of the greatest movie songs of all time, even winning the Academy Award for Best Song in 1970.