Axiom

Ask the Ages cover

Ask the Ages

 Sonny Sharrock
Transmutation (Mutatis Mutandis) cover

Transmutation (Mutatis Mutandis)

 Praxis
The Trance of Seven Colors cover

The Trance of Seven Colors

 Maleem Mahmoud Ghania, Pharoah Sanders
Too Much Sugar for a Dime cover

Too Much Sugar for a Dime

 Henry Threadgill