Is this Morton Feldman piece considered rare?

Yes, as a specific 1989 Non-Music piece in the Contemporary Poetry style, it holds niche collector value.

What genre classification should I use when selling this?

You should list it under Non-Music, Classical, and Contemporary, highlighting its Poetry aspect.

The appeal lies in its unique 1989 creation date and its classification as a Contemporary Poetry work by Feldman.

Name: Morton Feldman - Three Voices (For Joan La Barbara)
Brand: Morton Feldman

Non-Music

Non-Music · 1989

Year · 1989Genre · Non-Music, ClassicalStyle · Contemporary, Poetry

Used

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New / Sealed

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Is this Morton Feldman piece considered rare?: Yes, as a specific 1989 Non-Music piece in the Contemporary Poetry style, it holds niche collector value.
What genre classification should I use when selling this?: You should list it under Non-Music, Classical, and Contemporary, highlighting its Poetry aspect.
What is the general market appeal of this item?: The appeal lies in its unique 1989 creation date and its classification as a Contemporary Poetry work by Feldman.