A furious Kanye West threw a tantrum at last weekend's (04-06AUG06) Lollapalooza festival in Illinois after a technical problem marred his set, according to US reports. The superstar rapper was performing at the Grant Park extravaganza in his hometown of Chicago on Saturday (05AUG06) when the sound was suddenly cut. A source tells the New York Daily News, "He threw a hissy fit. When the sound didn't work, he started yelling that he came all the way out to Chicago and he couldn't believe he was being treated like this." West was reportedly so upset he snubbed his own party for producing trio SA-RA later that night.