The KLF (A.K.A. The Justified Ancients of Mu Mu, furthermore known as The JAMs) are a British electronic music band founded by Bill Drummond and Jimmy Caughty on January 1, 1987. They are known for the British number 1 hit, "Doctorin' the TARDIS" (released under the name, The Timelords), their book The Manual (How to Have a Number One the Easy Way), and their string of international hits, making them the best-selling singles act of 1991.

This was followed by their appearance at the February 1992 BRIT Awards, where they performed a metal version of their hit song "3 a.m. Eternal" with Extreme Noise Terror, fired machine gun blanks at the audience and placed a dead sheep at the after party. The band then departed the music industry, deleted their entire back catalog, and burned one million pounds sterling.

Bill Drummond and Jimmy Caughty remain active as artists, authors, and musicians and have collaborated on various projects since their final acts as The KLF. Their work as authors and musicians has had a lasting effect and are considered

Their work frequently makes explicit references to The Illuminatus! Trilogy as well as Discordianism.

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