Quivver is the recording name of John Graham, a UK singer, songwriter, DJ and producer working in electronic music, house, progressive house and trance. He also records under the aliases Skanna, Stoneproof and Space Manoeuvres. Skanna is used for drum and bass, Stoneproof for house and Space Manoeuvres for trance.

Graham is a former member of the 1990s production team Tilt. He also works with Hybrid and appears as a guest vocalist on the album I Choose Noise. In addition, he takes part in the Planet Funk album as a vocal member. He tours with Hybrid as a semi-permanent vocalist, alongside Charlotte James.

Under the Quivver name, Graham releases the album Dirty Nails & Vapour Trails on Critical Rhythms.