"Toxic" by Britney Spears is performed in the key of C minor. Released in 2003, the song was written by Christian Karlsson, Pontus Winnberg, Cathy Dennis, and Henrik Jonback. It was produced by Bloodshy & Avant. "Toxic" showcases a blend of pop, dance, and electronic elements, featuring catchy hooks and a pulsating beat. The song's lyrics revolve around themes of infatuation and obsession. Notably, "Toxic" became one of Britney Spears' signature songs and was a commercial success, topping the charts in several countries. It also earned critical acclaim, winning Spears her first Grammy Award for Best Dance Recording in 2005.