Heinz Holliger
The artists represented by Ingpen &amp; Williams include, among many others, Richard Armstrong, Pierre Boulez, Alfred Brendel, Janina Fialkowska, the Guarneri Quartet, Barbara Hendricks, Heinz Holliger, Ralph Kirshbaum, Paul Lewis, Peter Serkin, Graham Vick, Roger Vignoles, Radovan Vlatkovic, the Chicago Symphony Orchestra and West-Eastern Divan.