>> in their 20s, they're rich, powerful, temperamental, and pampered. they are the led zeppelin, a rock group on tour, and in the vernacular of the record business, where big is nearly nothing, zeppelin is very big. to get around, zeppelin uses a chartered 707, the kind of plane president nixon uses. ♪ the president's plane doesn't have an organ nor 15-foot mirrored bar, nor in the private quarters does it have two bedrooms and a fireplace. >> i'm a bit upset it doesn't have a pool table onboard. apart from that, i think this is the best way to travel. >> americans are now spending $2 billion a year on music. that's $700 million more than