Tangled Up is the fourth studio album by English-Irish girl group Girls Aloud. It was released through Fascination Records and Polydor Records on 16 November 2007, and was distributed in two physical formats and made available for digital consumption. The album is a pop record that incorporates elements of dance-pop, synth-pop, and various EDM sub-genres produced by long time-collaborators Brian Higgins and production team Xenomania. Marking a more mature approach according to group member Cheryl, the album lyrically delves into themes of love, relationships and femininity, and it was the group's first experimentation with tools such as autotune and vocoder. Production and development began with each member meeting with Higgins to discuss their personal and professional experiences since the release of their third album Chemistry (2005). It was recorded separately from April to October 2007, with the band members earning songwriting credits for two tracks off the album.