Who is that masked stranger?

Tonight we live-streamed "Montags 851", a gig from Zurich featuring Nik Bärtsch on piano (the masked stranger on our living room wall) along with his musical colleagues Kaspar Rast on drums and Jeremias Keller on bass. Fantastic gig and well worth paying 5.90 Swiss francs (about £4.60) for it. There really is some amazing music out there in spite of everything.