How Roger Waters Turned His 'Radio K.A.O.S.' Tour Into a Live Phone-In Show

The most striking thing about the Radio K.A.O.S. tour wasn’t the quadrophonic sound or the 40-foot screen—it was the telephone. During the show, Waters would pick up a hotline and take live calls from the audience, letting strangers debate, joke, or even sing on stage. That call-in gimmick turned the concert into a real-time radio broadcast, exactly the kind of messy,