"Unchained Melody" is a 1955 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.
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This song gained worldly fame after being used as one of the soundtracks in Ghost, starring Demi Moore, Patrick Swayze and Whoopi Goldberg. This song has created some sort of mass-hysteria ever since.
This is one of the most moving songs that I've ever listened to in my life. The high pitch near the end of the song is amazing. I think it went really really well with Ghost.