Well,then someone better tell Bruce Springsteen,because they play boots of his shows all the fuckin' time.I'm not just referring to a song here and there,I'm talking about complete concerts.At one time,I thought it was very peculiar,because Bruce is famously um,"finicky" about the quality of shows to release to his fans officially-kind of like someone we know -but Sirius has pretty much carte blanch, in regards to what they play.From what I heard,they put up a pretty good sized chunk of change for the privilege.
Maybe Led Zep turned down that particular part of the deal.