G.W. Sok (born 1957, real name Jos Kleij) is a Dutch singer, best known for his 30 year career as the frontman of the The Ex. G.W. Sok left The Ex in 2008 to focus on a solo career and collaboration projects with other musicians, participation in theatre performances and spoken word performances. Apart from his musical career he's also active as a writer and a graphic designer.

After leaving The Ex, Sok started to collaborate with several acts among which the French experimental free jazz band Cannibales & Vahinés and the Italian band Zu. In 2010 the single "2-2-3 Fridges/Rid" appeared on Sickroom Records. He joined the Dutch collective Beukorkest on their 2011 tour.

In 2011 Sok released the book A Mix of Bricks & Valentines, a 400 page collection of The Ex lyrics and other lyrics he wrote. Also in 2011 De Eeuwige Optie (The Everlasting Option) was published, an experimental film by SpOp featuring Sok as an actor. He also wrote the words for the film's ending track "Illusies". This track was also released as the 7 inch "Illusies 1 & 2" under the bandname Zoikle, consisting of Sok, guitarist Lukas Simonis, cellist Nina Hitz, drummer Cor Hoogerdijk and Maarten van Gent on metal percussion. King Champion Sounds arises from the ashes of the band that was called The Bent Moustache, the musical act of Krommenie-based, Kenya-born, UK-raised Ajay Saggar. This incarnation sees Saggar teaming up with, amongst others, Oli Heffernan (Year of Birds, Shrug) and G.W.Sok. In 2014 he published a double 10" with the UK noise act Action Beat.