'Adrienne Soós and Ivo Haag also have so many tone colours on offer that this version can rightly stand side by side with the original. These arrangements are outstanding examples of their genre and the same can be said for the interpretation of the piano duo Soos–Haag.' (Wilfried Schäper, Radio Bremen, on the recording of Brahms' Symphony No. 3)

The Hungarian-Swiss piano duo Adrienne Soós and Ivo Haag, who have long been seen as one of the best chamber music ensembles in Switzerland, delight in discovery and consistently meet the highest of artistic standards. Whether they are turning their talent and attention to the piano duo versions of Brahms' symphonies—all of which they are currently recording for the German label Telos—performing Franz Schubert's works for piano duos, or rediscovering pieces of music that are rarely performed, Soós and Haag are always driven by the desire to make the rich repertoire of music for piano duets and for two pianos accessible to a wide audience. With large-scale projects such as the performance of complete cycles of the four-hand piano works of Franz Schubert and of Debussy/Ravel in Boswil, as well as their well thought-out, intelligent programmes, they have earned themselves an outstanding reputation far beyond the borders of Switzerland. These projects bring them together with artists such as the piano duos Labèque, Tal & Groethuysen, GrauSchumacher, and others. Their recitals have seen them perform in countless locations and with countless ensembles including the Lucerne Festival, the Warsaw Philharmonic, the Internationale Pianisten Mainz series by the German broadcaster SWR, the Schumann-Haus Zwickau, the Haydn Festival in Eisenstadt, the Schubertiade Feldkirch, the Carinthian Summer Music Festival, the Musiktage Mondsee (artistic director: András Schiff), the Theater Casino Zug, the Sommets Musicaux de Gstaad, the Société de Musique in La Chaux-de-Fonds, the Kammermusik Bern series, the Ittinger Sonntagskonzerte, the Tonhalle-Gesellschaft Zürich, and much, much more.
The Filarmonica Toscanini Parma, the Sinfonieorchester Biel Solothurn, the Bern Symphony Orchestra, the Lucerne Symphony Orchestra, the Orchester Musikkollegium Winterthur, the St. Gallen Symphony Orchestra, the Zuger Sinfonietta, the Zurich Chamber Orchestra, the Camerata Bern, the Camerata Zürich, and many more engage them as soloists, where they work with conductors such as Mario Venzago, Zsolt Nagy, Thomas Rösner, Peter Hirsch, or Jac van Steen. When it comes to concerts with orchestras too, they are always on the lookout for new discoveries for their repertoire. For example, they were the first to perform Jean Françaix's double concerto in Austria (at the Carinthian Summer Music Festival) and the first to perform the double concerto by Péter Eötvös in Switzerland (Biel). They have frequently performed with choirs such as the Warsaw Philharmonic Choir under the direction of Florian Helgath or the Arnold Schoenberg Choir Vienna under the direction of Erwin Ortner.
Their projects in contemporary music bring them together with such notable figures as Péter Eötvös, Rudolf Kelterborn, Krzysztof Meyer, or Dieter Ammann.
In recent years, the piano duo has recorded works by Brahms, Schubert, Schumann, Bartók, and others for Telos Music, while their extensive discography also includes works by Honegger, Messiaen, Kelterborn, Ammann, Moscheles, Dussek, Hans Huber, and others. Their concerts are regularly broadcast on radio.
Adrienne Soós and Ivo Haag both studied in Budapest at the Liszt Academy under Péter Solymos, György Kurtág, and Ferenc Rados, among others. Their cooperation with András Schiff, who was their artistic advisor for quite some time, has had a major influence on them.