In my experience it is highly impractical to expect someone to try anything for 70 minutes before deciding if they like it. Some kind of step-wise introduction is more helpful.

It's not easy with Feldman, but I am convinced it is possible.

Here is a 2 minute excerpt of "Palais de Mari" from 1986 (for solo piano) that may help people decide whether they want to hear more: http://ivancdg.com/music/1.mp3

People have told me that this reminds them of Debussy (the Prélude "Footprints in the Snow", specifically).