Exposition of Music – Electronic Television

Joseph Beuys demolishes one of Nam June Paik's four pianos

During the exhibition 'Exposition of Music – Electronic Television' of Nam June Paik,
in March 1963 in Galerie Parnass, Wuppertal, Joseph Beuys demolished unexpectedly one of four pianos, which Nam June Paik had prepared with objects of daily use and barbed wire for his second solo-exhibition.
Neither the galerist, Rolf Jährling, nor Nam June Paik, nor the audience was informed before about Beuys' performance.
Joseph Beuys was since 1961 professor at the Kunstakademie Düsseldorf.
https://www.artist-info.com/gallery/Galerie-Parnass

Source: https://www.artist-info.com/blog/influential