The final performance of “U2: UV Achtung Baby” at the Sphere on March 2 is being streamed at 5 p.m. Pacific time Sunday on U2 X-radio (Sirius XM Channel 32) The final act, as it were, is an interview with the band, recorded at Zoo Station at The Venetian at 4 p. The encore to the entire 40-night stand was “40,” which not been played live since November 2015.