Two Micks gracing the Rolling Stones stage? “It’s only Rock and Roll,” and it happened in front of 5,000 people in Chicago last night. Bono, in town for his Oprah appearance, joined the Rolling Stones for one song in the Aragon Ballroom. An enthusiastic fan on Usenet’s alt.rock-n-roll.stones writes: “Bono wandered onto the stage unannounced early in the song dressed in black with his trademark glasses. Bono took “It’s Only Rock and Roll” into “Going to a Go Go,” which Mick followed. Bono then ad-libbed a “Going to Chi-ca-go” line. Bono’s appearance was a complete surprise. It pushed an already great show into the stratosphere.”