RotoSound is a guitar and bass string manufacturing company based in England.

Rotosound's trademark Swing Bass string set was first produced in 1966. John Entwistle of The Who came to the Rotosound string factory looking for an even, heavy roundwound bass string. Entwistle spent the afternoon there, trying string after string before settling on a set that would become known as Swing Bass 66. A fake jingle for RotoSound can be heard on The Who's 1967 album The Who Sell Out.

• John Deacon (Queen)
• John Entwistle (The Who)
• John Paul Jones (Led Zeppelin)
• Chris Squire (Yes)
• Geddy Lee (Rush)
• Paul McCartney (The Beatles)
• Kasabian
• The Zutons
• The Cribs
• Puddle of Mudd
• Velvet Revolver
• Surferosa
• The Ordinary Boys
• The Vines
• The Iron Maidens
• Pitchshifter
• Busted
• Billy Sheehan (SwingBass66)
• Steve Harris (Signature Set)
• Bob Geldof
• Oasis (JazzBass77)
• Nirvana
• Jan Cyrka
• Tantric
• Raging Speedhorn
• Nelly Furtado
• Steve Walters
• Beverley Knight
• M People
• Jean-Jacques Burnel
• Gordon Giltrap
• Mani
• Sophie Ellis Bextor
• Crackout
• Herbie Flowers
• Neil Brocklebank
• Cast
• Bruce Foxton
• The Jimi Hendrix Experience
• Robbie Williams
• Lol Cottle
• Stanley Clarke
• John Renbourn
• Ed Guzman (FM66)
• Midus
• Jaco Pastorius
• Seafood
• Hugh Cornwell
• JJ Belle
• Neil Stubenhaus
• Mo Foster
• Jon Noyce
• Status Quo
• The Cure
• Therapy?
• Pulp
• The Almighty
• Silver Ginger 5
• Wilt
• Spiritual Beggars
• Kick
• Paul Geary
• Jet Harris
• Julian Cope
• Keith Airey
• Björn Again
• Phil Chen
• Sade
• Shed Seven
• The Dandys
• Entombed
• Dr Feelgood
• Buzzcocks
• John Giblin
• Gene
• Boon Gould
• The Hamsters
• Roger Innis
• Kaziah Jones
• The Levellers
• Gerry McAvoy
• Naomi
• Rachel Stamp
• Paul Scott
• Dark Star
• Tribute to Nothing
• Echo and the Bunnymen
• PJ Harvey
• Nik Kershaw
• The Lightning Seeds
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• The Lighthouse Family
• M People
• Mansun
• The Relatives
• Carrie Melbourne
• Fairport Convention
• Dave Paton
• Pist-On
• Noel Redding
• The Rapiers
• Snowy White
• Pennywise
• Pink Floyd
• Phil Lynott
• Duff McKagan
• James LoMenzo
• Derek Holt
• Lemonheads
• Massive Attack
• Napalm Death
• Slash’s Snakepit
• The Damned
• Siouxsie and the Banshees
• Kennedy Soundtrack
• Steve DiGiorgio
• Doug Wimbish
• Dave Pegg
• Peer Günt
• Keith Rosier
• Cradle of Filth
• Duran Duran
• John Taylor
• Hugh Carter
• Ken Morton
• Brian Steeples
• Roger Waters