"I'm Not Alone" is a song by Scottish recording artist Calvin Harris, released as the lead single from his second studio album, Ready for the Weekend. The track was first played by Pete Tong on BBC Radio 1 as his "essential new tune" on 23 January 2009 and has been described as a slice of euphoric dance. On 12 April 2009, the song debuted at number one on the UK Singles Chart, earning Harris his first solo number-one single on the chart and second overall following his 2008 collaboration with Dizzee Rascal and Chrome, "Dance wiv Me".
Harris said of this song: "The whole track's a light and shade thing, two styles put together. I find it quite hard to write a happy-happy lyric now, for some reason. I don't know why that is, to be honest with you. Maybe it's staying in a room for a huge amount of time on your own, and that's reflected in the lyrics!"
"I'm Not Alone" debuted at number one on the UK Singles Chart on 12 April 2009 ― for the week ending 18 April 2009 ― knocking Lady Gaga's "Poker Face" off the top of the chart. It remained at the top position for two weeks, until it was dethroned by Tinchy Stryder's "Number 1" featuring N-Dubz. On 3 January 2010, "I'm Not Alone" reentered the chart at number ninety-nine.
In the Republic of Ireland, the single debuted at number fourteen on the Irish Singles Chart on 9 April 2009, peaking at number four by its third week.
When Chris Brown's 2010 single "Yeah 3x" was released, comparisons by critics to "I'm Not Alone" and a tweet by Harris himself led to controversy resulting in Brown adding Harris to the song credits, though no legal action was taken. The claims of theft caused multiple Brown fans to harass Harris over Twitter. The two artists reportedly have no hard feelings toward each other since the controversy; Harris even called Brown his "best mate" and said that he enjoys listening to his work.
The clip begins with a small boy (potentially meant to represent a young Harris) found in thick snow wandering the woods dragging a sledge with a toy bear on top. He then sets up camp and lights a fire to keep warm whilst cuddling his toy bear. The bear is then found on the sledge again and is then dropped. The scene closes and cuts to a dungeon styled setting that showcases Harris portrayed as a Frankenstein-type character who is seen to perform experiments on numerous female captives, combining their essences to reanimate his "lost" teddy bear.