Edited sentence: It also contained one of Zeppelin's most beloved recordings, Kashmir.It was an absolutely massive financial success, hitting #1 on the billboards and bringing all of their other albums on there as well.Not only is Physical Grafitti considered to be Led Zeppelin's heaviest LP, it's also widely regarded as one of the heaviest albums ever made.That's a record, because there had never been as many albums from one band on the billboard at once like there was when Physical Grafitti was released