"Levels" (stylized as "LE7ELS") is a progressive house piece by Avicii. An early instrumental version of the song was first played by Avicii during an appearance on Essential Mix in December 2010, while the final version with Etta James's vocals was first performed at the Ultra Music Festival in March 2011. "Levels" was officially released on 28 October 2011 and peaked at number one in Sweden and on the Dance music charts in United States and became a top ten hit in Austria, Belgium, Bosnia-Herzegovina, Croatia, Denmark, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Norway, Switzerland, and the United Kingdom.