What does 1+1 stand for? 

1+1

1+1 is a song recorded by American recording artist Beyoncé for her fourth studio album, 4 (2011). It was released by Columbia Records in the United States on May 25, 2011, as a promotional single. Serving as the opening track on 4, it was written and produced by The-Dream, Tricky Stewart and Beyoncé. "1+1" was originally titled "Nothing But Love" and The-Dream had initially planned to include it on his second studio album, Love vs. Money (2009). A down-tempo contemporary R&B and soul music power ballad, "1+1" Beyoncé expressing her endless love to her soul mate; the lyrics make strong statements about the power of the relationship. "1+1" garnered acclaim from music critics, who noted its resemblance to the work of American singers Prince and Sam Cooke. It was also complimented for its subtle instrumentation, which provides emphasis on Beyoncé's vocals. "1+1" peaked at number 82 on the Canadian Hot 100 chart and at number 57 on the US Billboard Hot 100 chart. Its accompanying music video was directed by Beyoncé herself, alongside Lauren Briet and Ed Burke, and it premiered on August 26, 2011. The video was a "different" direction in the sense that it does not incorporate the heavy dance routines Beyoncé is known for, and that it experiments with psychedelic visual effects as well as innovative lighting, which give the clip a cinematic feel. The clip met with generally positive reception from music critics, who praised its aesthetic and sexual theme and claimed that it will be remembered as one of Beyoncé's most iconic visuals.

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