Question: It was this day in Rock History in 1973, these guys opened their 1973 North American tour, which was billed as the ‘biggest and most profitable rock & roll tour in the history of the United States’. Who was it?

Answer: It was Led Zeppelin! The guys would gross over $4 million from the dates, flying between gigs in ‘The Starship’ a Boeing 720 passenger jet, complete with bar, shower room, TV and video in a 30′ lounge and a white fur bedroom.