All in My Head (Flex)

"All in My Head (Flex)" is a song recorded by American girl group Fifth Harmony, featuring guest vocals by American rapper Fetty Wap, for their second studio album, 7/27 (2016), which was released on May 27, 2016. It was produced by Stargate and Brian Garcia with additional production by Sir Nolan. Musically, "All in My Head (Flex)" is a reggae-trap song backed by synths, percussion, and guitar, containing an interpolation of the 1992 song "Flex" by Mad Cobra. The song was released as the second single after a special encore performance on Xfinity following the 2016 Billboard Music Awards on May 22.