This week, Nathan Irwin is talking with David Commanday, Music Director of the Heartland Festival Orchestra. In their next concert, the orchestra is joined by three former finalists from "American Idol." Commanday talks about the three guest artists, and the different genres and vocal types they represent. He says the concert offers the orchestra an opportunity to present a different type of repertoire. And he talks about "American Idol" as a cultural and musical phenomenon.