Bill Drummond and Jimmy Cauty, best known as "stadium house" act KLF, are returning to the music business. In their latest incarnation, 2K, they are due to stage a performance Tuesday titled "For 23 Minutes Only" at London's Barbican Centre. The show will be recorded and released Sept. 22 as a single in the U.K. on an undetermined label. KLF (aka Justified Ancients Of Mu Mu) had six top-10 U.K. singles in 1990-92 on its KLF Communications label, including the No. 2 hit "Justified And Ancient" featuring Tammy Wynette. Drummond and Cauty are noted self-publicists: In 1992, they announced that they would delete their entire back catalog; the following year, they set up the K Foundation and moved into the art world; and in August 1994, they publicly burned a large mound of their own money.