Songfacts®:

• In this song, Leo Sayer is lovestruck by a woman he met just an hour ago. The voice in his head tells him not to fall so hard for someone he just met, but there's a thunder in his heart that drowns it out. He's under the influence of other weather metaphors as well: There's a storm in his soul and his love falls like rain.
• Sayer wrote this with Tom Snow, an American who went on to write the hits "Let's Hear It For The Boy" (Deniece Williams) and "You" (Rita Coolidge). "Thunder In My Heart" was Snow's first hit as a writer.
• Sayer was at the tail end of a hot streak when he released this song. His 1976 album Endless Flight, produced by Richard Perry, had two #1 US hits: "When I Need You" and "You Make Me Feel Like Dancing." Perry produced his next album, Thunder In My Heart, and this title track was released as the first single. With a disco sound fit for the times, it went to #38. Sayer's next single, "Easy to Love," went to #36, and then his hits dried up for a while. He got back in form with "More Than I Can Say" in 1980.
• "Thunder In My Heart" became a UK #1 hit in 2006 when it was remixed by DJ Meck (Craig Dimech), who found a vinyl copy of Sayer's original in a Los Angeles record store and decided to turn it into a dance mix. DJs like Fatboy Slim started playing the track, unaware it was a Sayer song.
• Sayer gave his blessing for the remix. In the London Times, February 13, 2006, he said: "He's changed it completely, yet kept all of its integrity. They said I'd be the kiss of death. All those DJs wouldn't touch the thing with a barge pole."