I think Dave said it best when he refers to his daughter as "the next generation of Rock and Roll." Violet performed with her ole dad and the Foo's at Lollapalooza this past weekend in Chicago. They teamed up to cover the LA band "X" and their classic Nausea. Dave also got his other daughter involved too as the crowd sang Happy Birthday to the now 7 year old "FiFi." It was a family affair and it was awesome.. Here's what went down.