“Thunder” is a song by British singer and songwriter Leona Lewis from her fifth studio album, I Am (2015). The song was written by Lewis and Toby Gad, who also produced the track. Lyrically, “Thunder” is about finding the strength to pick yourself up after falling on difficult times. Lewis explained that the song is about self-reflection and self-empowerment and finding the ability to look within in order to decide what is best to do next. Def Jam released “Thunder” on 24 July 2015 as the lead single in United States, but it is the third single to be released from the album overall. Remixes by Danny Verde and Tom Swoon were also released.
The track garnered a positive response from music critics, many of whom complimented its powerful and anthemic stance and declared it an album highlight. One critic believed the lyrics to be directed at Simon Cowell, Lewis’ former label boss. “Thunder” reached the top thirty on the U.S. Billboard Adult Contemporary and Adult Pop Songs charts, and the top twenty on the Dance Club Songs chart. The song’s accompanying music video shows Lewis in a variety of outdoor spaces as clips of varying weather patterns are intercut. She has performed the track on several U.S. television shows, including Good Morning America, The Late Late Show with James Corden and The Talk.