Best of luck. Give them hell. Maybe they need you to give it the Clash and Buzzcocks it needs. I'm a beginner player (just since January this year) and I've been asked to join a band, but the thing is I know the guys already and have a strong feel of their influences (Pink floyd, nirvana, metallica etc...). My advice is to get to know these guys as much as possible, that will help you relax at the audition. Make sure your gear is up to spec (strings good, effects pod is ready, variety of plectrums, etc....).