Julia Steffensen, 3, (from left) Karin Steffensen, and Olivia Steffensen, 5, of Libertyville, enjoy music with Dave Rudolf on Tuesday, Aug. 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media

Eugene Kaykov and daughter Shauna Kaykov, 4, of Vernon Hills dance together during Dave Rudolf's mini concert Tuesday, Aug. 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media

Daniel Zhuang, 9, of Vernon Hills with a little limbo on Tuesday, aug. 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media

Cate Lundy, 5, of Libertyville in the congo line during a mini concert Aug. 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media

Kids enjoy a bubble machine during a mini concert Aug, 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media

Emma Schmidt, 6, of Vernon Hills gets ready to fly to a song by Dave Rudolf during a mini concert Aug. 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media

Dave Rudolf of Park Forest performs Aug. 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media

Dave Rudolf of Park Forest does the sprinkler during his performance Aug. 14, 2012, at Cook Park in Libertyville. | Joe Shuman~Sun-Times Media