When a global pop star hits the road — as a conclave of elder rockers will do on October 7 at the Desert Trip festival in Indio, California, a.k.a. Oldchella — truckloads of cables, computers, instruments, lights, and audio gear follow along. A record label may hire a professional singer and pay for the production and recording of their work. Other companies, such as radio advertising corporations and variety show theaters, may hire singers.
