"Alone" is a song composed by Billy Steinberg and Tom Kelly. It first appeared on via Steinberg and Kelly's pet project, 1983's I-Ten, Taking a Cold Look. It was later recorded by John Stamos in his role as Gino Minelli, on the original soundtrack of the CBS sitcom Dreams in 1984. American rock band Heart made it a hit in 1987. Twenty years later, Céline Dion recorded it for her album Taking Chances.

The song was given to Heart and released as the first single from their ninth studio album Bad Animals. Heart's version is a power ballad which begins with a piano line and a subdued vocal from Ann Wilson, only to build to a dramatic love song. "Alone" is Heart's biggest hit, spending three weeks at number 1 on the U.S. Billboard Hot 100. It is also their most successful single in the United Kingdom, where it peaked at number 3 on the UK Singles Chart. Paula Abdul was choreographer for the video.

From: http://en.wikipedia.org/wiki/Alone_(Heart_song)