It doesnt matter who you are, where youre from, what race box you check off on your SATs, or what class you belong to, everyone has a friend who is obsessed with 311. And, like it or not, that friend will try incessantly to wave their domineering reggae-funk-rock-rap politics in your face like a joint that needs passing. Theyll pontificate over the etymological origins of the groups name. (Is it the bands favorite time of the day to smoke pot? Is it a reference to the KKK? Was it lead singer Nick Hexums locker combination in high school?) And theyll try desperately to convince you that 311s version of Love Song was far superior to The Cures (Robert Smith is rolling over in his grave oh, hes not dead yet?). But there is something instinctual about 311s sound: Perhaps its the admirable and unifying simplicity of using only a single drum beat and guitar riff over a 15-year career. Or maybe its that the spacey, undulating thuds and kick-start rhythms of classic tracks like Down and Beautiful Disaster almost demand a wanton head bob and fervent toe-tap or two. So call up your unemployed buddy and bring him/her to the show this Tuesday at Sound Advice Amphitheatre (601-7 Sansburys Way, West Palm Beach). Tickets cost $25 to $35. Call 561-795-8883.