maría isabel siewers has performed in wigmore hall (london), the vienna konzerthaus, martinu hall (prague), carnegie hall (new york), the théâtre des champs elysées (paris), she has played in many important music festivals and has appeared as soloist with, amongst others, the argentine national symphony orchestra, the prague virtuosi, the radio/tv orchestra of zagreb, the bohemian chamber orchestra, the national symphony orchestra of cuba, the kraków philharmonic, and the chamber orchestras of mayo and morón (argentina).