"Not Alone" is a song written and recorded by American rock band Linkin Park from the first compilation album, Download to Donate for Haiti. It is the twenty-first single by the band, which was released on October 21, 2011. The song is the opening track on the album. In addition for the song to be released as a single, it was partially released early on January 19, 2010 with the release of the album as a promotional single.

It is said that the electronic elements in the band's fourth studio album has its roots from this song. Mike Shinoda and Rick Rubin together released the single. This is the one and the only single from the compilation album. The song was also included in the album Download to Donate for Haiti V2.0 as a track which is a sequel for the compilation album. The band also included an instrumental song "Issho Ni" in the third sequel of the album, Download to Donate: Tsunami Relief.

The song has over 115,000 downloads as the release of the single. The same figures of progress was shown by the album. The single is the least successful single by the band, whereas it is the fourth most successful promotional single by the band after the song "A Light That Never Comes" with American electronic musician Steve Aoki that's also a single, "Lying from You" and "Powerless" as promotional singles. The song has raised over $148,350 for the Haiti earthquake.

The music video of the song was released on March 2, 2010 on YouTube, iTunes and Myspace. The video was directed by Bill Boyd. The video is a footage type music video. It contains footage of the tragedy and crisis took place in Haiti after the earthquake. It also contains an advertisement for the compilation album at the end of the video.

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