"Unchained Melody" is a 1955 popular song with music by Alex North and lyrics by Hy Zaret. It has become one of the most recorded songs of the 20th century, by some counts having spawned over 500 versions in hundreds of different languages.
In 1955, North used the music as a theme for the prison film Unchained, hence the name. Todd Duncan sang the vocals for the film soundtrack. Les Baxter (Capitol Records catalog number 3055), released an instrumental version which reached #2. .