In one of the more surprising sit-in moves this spring, over the weekend Rage Against the Machine/Audioslave guitarist Tom Morello played with Dave Matthews Band on two separate occasions. Morello is currently touring in support of his new solo acoustic album, One Man Revolution, which was released under his politically charged singer/songwriter alias, The Nightwatchman. After opening for Dave Matthews Band at Lisbons Atlantic Pavilion on Friday, Morello joined the group on acoustic guitar for #41 and American Baby Intro. Two nights later, Morello returned to the stage at Brussels Forest National for another version of #41 and his first stab at Satellite. Tomorrow, Dave Matthews Band and Morello will likely share the stage again at Londons Wembley Arena.