That Thing You Don't - S3.E10

The gang decides to get the old band back together for a battle of the bands contest at the Warsaw. Kate desperately wants to be lead vocalist but the guys are hesitant because she's an awful singer. The guys run into Herb, an old high school rival, who is confident his band will crush Drew's in the contest. The gang is determined to win but the guys know they won't if they let Kate sing.