"Witness (1 Hope)" (occasionally known as "Witness the Fitness") is a song by British rapper Roots Manuva, released as the first single from his second studio album Run Come Save Me (2001). A hip hop song with influences of dancehall and funk music and an electronically-inspired bass line, it contains lyrical references to Roots Manuva's British cultural roots with a deliberately similar melody to the theme song to TV show Doctor Who. Record labels Big Dada and Ninja Tune released "Witness (1 Hope)" in various formats during July 2001.

The song was a minor commercial success in the United Kingdom, where it briefly appeared on the UK Singles Chart and peaked at number 45 in August 2001, and won much acclaim from music critics for the musically diverse production and also Roots Manuva's embrace of his own cultural tropes, in contrast to the American cultural features used throughout much hip hop, including in Britain, at the time. A music video for "Witness (1 Hope)" directed by Mat Kirkby, which features Roots Manuva taking part in a sports day at his previous, real-life primary school, also won praise for its humorous and original plot.

The song's production contains a "huge, electronic bass line" influenced by "stuttering, organic funk" and Jamaican dancehall, as well as a "pummelling low end" and "pulsating, throbbing rhythms" similar to those found in the work of production group Organized Noize. The bass line was deliberately designed by Roots Manuva to possess a "rickety... squelchy stamp of noise" in protest of the poor quality of many of the sound systems used in music clubs at the time, and the melody was intended to mimic the theme song to the television programme Doctor Who. Roots Manuva's rapping, which he described as "talk[ing for] three minutes over the top of [the production]", consists of "relentless, loping rhymes" that contrast with the "righteousness" of his Jamaican heritage with many references to British culture, such as eating cheese on toast and drinking the alcoholic beverage bitter.

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