21 Facts you may not know about Led Zeppelin’s Physical Graffiti (Rockin’ Rant #31)

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This week way back in 1975 Led Zeppelin's Physical Graffiti was certified gold. Here are 21 things you may not know about this amazing album
Topics covered:
-21 things about Physical Graffiti
-44 years old this year
-reference article: Article on Physical Graffiti