"Halo" is a song recorded by American R&B singer Beyoncé Knowles for her third studio album I Am... Sasha Fierce (2008). A pop power ballad containing R&B undertones, "Halo" is written in a moderate tempo of eighty-four beats per minute in the key of A major. Its instrumentation essentially consists of a piano, and keyboards and synthesizers. The song consists of a piano, and keyboards and synthesizers. The music is further amplified by soul claps and step stomps. Thematically, the lyrics to "Halo" describe a sublime love. he song was also praised for its production as well as Knowles' emotion-filled vocals, which were noted to be reminiscent of Céline Dion's work. "Halo" won "Best Song" at the 2009 MTV Europe Music Awards and Best Female Pop Vocal Performance at the 52nd Grammy Awards, where it was also nominated for Record of the Year. "Halo" has been covered by many artists since its release, including Florence and the Machine in 2009 and Westlife in 2010. It was also shown on the television show Glee, where the song was mashed-up with "Walking on Sunshine", by Katrina and the Waves.