Under his leadership, these two choirs frequently toured North and South America, the former Soviet Union, Egypt, Israel, Korea, Taiwan, and Africa, in addition to all of the European countries.
[1] He served as guest conductor and held choral workshops and conducting master classes in Sweden, Spain, Russia, Israel, Korea, and the United States.
His students have become conducting professors, music teachers, and opera singers in various countries (e.g., Blanca Anabitarte,[5] Christian Baehrens,[6] Eileen Chang,[7] Kristian Commichau,[8] Josep Vila Jover,[9] Jan Kobow, Frank Markowitsch,[10] Siegfrid Pockern,[11] Michael Riedel,[12] Ralf Sochaczewsky,[13] and Matthias Stoffels[14]).
Arvo Pärt dedicated[15][16] his now well-known Magnificat to Christian Grube and his boys' choir after they won the first prize in the German National Choral Competition.
Because of the diplomatic influence of his work throughout the world, in 1995 Grube was awarded the National Medal for Distinguished Service — the highest civilian honor given by the German government.