“21 Reasons” is a song by English DJ/producer Nathan Dawe featuring vocals from British singer Ella Henderson. It was released on 29 April 2022 by Atlantic Records (UK) and Warner UK for digital download and streaming. Written by Henderson, John Morgan, Maegan Cottone, Dawe, Rune RK and Will Lansley, with production from Dawe and Punctual, “21 Reasons” features a prominent sample of Rune’s 2003 dance song “Calabria”. It is Henderson second collaboration with Dawe since co-writing and having uncredited vocals on Dawe’s 2020 single “Lighter” with rapper KSI.