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Black Sabbath's "Paranoid" is an awesome tune that certainly inspired a lot of hard rock / heavy metal musicians. Black Sabbath was part of a beginning of a branch that unfortunately went too far from the main line toward Death metal, Satanic metal, etc.
While "Iron Man" and "Paranoid" could be played on some radio stations, and "War Pigs" on a few, "N.I.B." began crossing the line:"My name is Lucifer, please take my hand..."

Ozzy's rhyming needed some work too: (the very first two lines in "War Pigs")
Generals gathered in their masses
just like witches at black masses

Deep Purple had difficulties with the roster changes in the various lineups but had some great tunes, especially later with 'Perfect Strangers'.
In no particular order:

-Highway Star
-Space Truckin'
-My Woman from Tokyo
-Smoke on the Water
-Mary Long
-Speed King
-Black Night

The 'Perfect Strangers' Album had some very good tunes
-Perfect Strangers
-Knockin' at Your Back Door
-Nobody's Home
-Gypsy's Kiss
-Not Responsible

"Mitzi Dupree" and "Hard Lovin' Woman" off of their 'House of Blue Light' album are good ones and fans might like "Somebody Stole My Guitar" and "The Aviator" off of 'Purpendicular'.