Lee Jay Thompson (born 5 October 1957), nicknamed Kix or El Thommo, is an English multi-instrumentalist, singer, songwriter, and composer.

In a career spanning 45 years, Thompson came to prominence in the late 1970s as a founder and saxophonist for the English ska band Madness.

After reading about the emerging New York graffiti scene, they spray-painted their nicknames ("Kix" and "Mr B") along with two friends' names "Cat" and "Columbo" around North London.

[2] Thompson founded Madness with Mike Barson and Chris Foreman in 1976, and wrote the group's debut single, "The Prince".

His experiences of being a petty criminal and serving time in borstal in his youth[3] inspired his lyrics for "Land of Hope and Glory" and "One's Second Thoughtlessness", the latter an unusual diversion into synthpop for the group.