The guitarist for hardcore rock bands Rage Against the Machine and Audioslave, Tom Morello has toned things down considerably with his new acoustic solo act the Nightwatchman. Hear his softer side on Friday, Sept. 2, at 7:30 p.m. The Birchmere, 3701 Mount Vernon Ave., Alexandria. Tickets are $25. Call 703-549-7500 or visit birchmere.com.