"Bad" (also stylised as BAD!) is a song by French house music producer and disc jockey (DJ) David Guetta and Dutch production duo Showtek, featuring vocals from Australian singer Vassy. It was released on 17 March 2014 as the second single from Guetta's studio album, Listen. It was written and produced by Guetta, Showtek, Sultan & Ned Shepard, and Manuel Reuter and it was co-written by Giorgio Tuinfort, Ossama Al Sarraf, Vassy, and Nick Turpin. The song entered and peaked on the UK Singles Chart at number 22. This track has since topped the chart in Finland and Norway. The song, which features vocals from Vassy, features her with an Auto-Tuned voice; reviews were critical of the effects applied to the vocals.