"Song 4 Mutya (Out of Control)" is a song produced by British music duo Groove Armada, featuring vocals by recording artist Mutya Buena. Initially intended to feature British singer Estelle, the duo ultimately decided to collaborate with Buena on the song following her departure from girl group Sugababes in December 2005. Supported by a new wave-inspired beat, dance synthesizers and a bass line, it is an uptempo electronic and electropop song. The lyrics were interpreted by the media as an "insult" to Buena's Sugababes replacement Amelle Berrabah, although Buena herself has denied such allegations.

The song's production was met with critical acclaim, and various critics named it the song of the summer, while The Guardian and Xtra! highlighted it as one of the best songs of 2007. The song peaked at number eight on the UK Singles Chart and reached number one on the UK Dance Chart. It reached the top forty in Australia, Finland, Ireland and the Netherlands. The single's music video was filmed in Finsbury Park, North London and features a festival theme.

"Song 4 Mutya (Out of Control)" was written by Andy Cato, Tim Hutton, Karen Poole and Tom Findlay, and produced by the former two under their stage name Groove Armada. The song features uncredited vocals by English singer Mutya Buena, a former member of girl group Sugababes. The song was included on Groove Armada's album Soundboy Rock (2007), and Buena's debut release Real Girl. It was initially intended to feature British singer Estelle with the title "Song 4 Estelle", but according to Groove Armada, "she didn't nail it at all". The production duo revealed how Buena ended up on the song, saying:

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