At the age of 20 Margit Süss-Schellenberger became principal harp of the North German Radio Symphony Orchestra in Hamburg and was among the young soloists selected nationwide by the Deutsche Musikrat, which brought her numerous concert engagements.

She also played as a guest for many years with the Bamberg Symphony Orchestra and for more than 10 years with the Berlin Philharmonic Orchestra (at that time under the direction of Herbert von Karajan and Claudio Abbado), where she played under all the great conductors, and participated on numerous CD recordings. For more than 20 years, she has performed with the Berlin Philharmonic Orchestra during the Salzburg Easter Festival.

As a concerto soloist she has performed with the Berlin Philharmonic Orchestra under Claudio Abbado, the National Orchestra of Lyon under Emanuel Krivine, the Jerusalem Symphony Orchestra under David Shallon, the English Chamber Orchestra, the Prague Chamber Orchestra, the Heilbronn Chamber Orchestra, the Tenerife Symphony Orchestra, and the North German Radio Orchestra Hanover among others.