How rare are these unreleased concert tapes?

These tapes are unreleased radio recordings from 1958, making them a rare find for Jazz enthusiasts.

What musical styles can I expect from this recording?

The music features Post Bop and Cool Jazz styles from the concert in Baden Baden.

The tapes are from a 1958 concert, though the listing year is 1988.

Name: Various - The Concert 23.6.1958 - Baden Baden - Unreleased Radio Tapes
Brand: Various

Jazz

Jazz · 1988

Year · 1988Genre · JazzStyle · Post Bop, Cool Jazz

Used

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New / Sealed

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How rare are these unreleased concert tapes?: These tapes are unreleased radio recordings from 1958, making them a rare find for Jazz enthusiasts.
What musical styles can I expect from this recording?: The music features Post Bop and Cool Jazz styles from the concert in Baden Baden.
Is this recording from the original 1958 performance?: The tapes are from a 1958 concert, though the listing year is 1988.