U2 on 50 years and their duet with Dolly Parton‎

The Irish quartet U2 is celebrating its 50th birthday with "Carnaval de Luz," their first album of new music in nearly nine years. Bandmembers Bono, The Edge, Adam Clayton and Larry Mullen Jr. talk with correspondent Anthony Mason about revisiting the Dublin school where they first came together; regrouping following Mullen's neck surgery; and the song "Torn," a duet with Dolly Parton that would prove to be her last recording.