Zappa interpreter Mats Öberg plays a brief piece on the Bruce Posner radio programme "Concert Grande," WFUV radio, New York, broadcast date 1993-02-22

Recorded "just a few days ago" (before 1993-02-22) at Lincoln Center Studios, New York
Mats Öberg - piano

Ruth Is Sleeping > Sleep Dirt improv > Ruth Is Sleeping (Frank Zappa) 6:37

Source: Bruce Posner's uploaded FLAC
Lineage: FLAC > Audition 2020 (crop, DC balancing, fades) > FLAC

The radio show was dedicated to Frank Zappa and featured an interview with Mat Öberg en Joel Thome, to announce a concert, "The Music of Frank Zappa," taking place on 1993-02-27, 8PM at the Avery Fischer Hall, New York: Joel Thome conducting the Music Today Ensemble and the Orchestra of Our Time, with special guests Mike Keneally, Scott Thunes, Mats Öberg and Morgan Ågren. Programme: piano concerto version of Night School (Zappa), solo piano version of Ruth Is Sleeping (Zappa), chamber orchestra version of The Girl In The Magnesium Dress (Zappa), Déserts (Varèse).

The whole one-hour radio show can be found at
https://archive.org/details/zappa-2-22-93