In our lexicon, a deep album track is one you'll never hear of the radio and was rarely (if ever) played live.

Today we visit the 70s discography of the mighty Black Sabbath to listen to the best of the deep album tracks of the Ozzy-era Mach 1.

Looking for some underrated metal today? Take a listen to this ... for the thrill of it all!!!

Master of Reality (1971)

(0:00) Lord of this World

Volume 4 (1972)

(5:23) Wheels of Confusion

(13:08) St. Vitus Dance

Saabbath Bloody Sabbath (1973)

(15:32) A National Acrobat

Side 2

(21:46) Looking For Today

Sabotage (1975)

(26:44) Thrill Of It All

Technical Ecstacy (1976)

(32:37) Back Street Kids

Never Say Die! (1978)

(36:24) Johnny Blade

(42:52) Air Dance