Fans of Limp Bizkit have started legal action over a performance the band stopped after just 17 minutes.
Fans claim the band are guilty of breach of contract
Lead singer Fred Durst led his band offstage after the crowd allegedly became hostile at a Chicago concert on 26 July.
Now a US lawyer is leading a class action against the singer to win compensation for those who bought tickets.
The angry fans say Durst himself was partly responsible for crowd trouble.
A spokesman for Cook County Court told BBC News Online "dozens" of fans were named in the action, with MTV.com putting the number at 172.
They are claiming Durst and the band's business arm Limp Bizness are guilty of breach of contract because fans expected a 90-minute set.
The Summer Sanitarium show at Cicero, Chicago, also featured performances from Linkin Park and Metallica.
The fans want the return of $25 (£15) of the $75 (£45) ticket price and lawyer Michael J Young is applying for the case to be made into a class action so all 40,000 at the event can get compensation.
The move follows unsuccessful legal action in April by fans of the rock band Creed, who claimed lead singer Scott Stapp was too intoxicated to sing at a concert near Chicago last year.