There has been a wealth of rock 'n' roll reunions of late, and while these things often amount to little more than a cynical cash grab, the reformed Afghan Whigs have shown surprising bite on the comeback circuit. Led by the charismatic, eternally louche Greg Dulli, the Whigs churn through a lethal mix of barbed alt-rock spiked with sneering funk, particularly as the band draws from its untouchable 1993 album "Gentlemen." Arrive early to catch the unclassifiable future-soul of opener Van Hunt. The Fonda Theatre, 6126 Hollywood Blvd,, Hollywood. Fri.-Sat. 8 p.m. $37.50. http://www.ticketmaster.com.