This article is a summary of lectures given in Nuernberg, Germany at a 1974 symposium for the restoration of musical instruments. The summaries are both in German and English. The following topics are discussed: 1) Cleaning and retouching varnish on bowed stringed instruments; 2) Staining new wood for restoring instruments; 3) Problems concerning necks of bowed instruments; 4) Early wind instruments in modern society; 5) Restoration of early 19th century woodwinds; 6) Restoration of brass; 7) Restoration on a double bass of the 17th century; 8) Restoration of two violins from the 17th and 18th centuries; 9) Cleaners, polishes, and protective coatings for brass; 10) Metal cleaning with complexing agents; 11) Restoration of a lute; 12) Restoration of an early 17th century guitar; 13) Substituting missing fragments to woodwinds; 14) Restoration of brass; 15) Restoration of a 15th century recorder; and, 16) Obtaining and recording data from single reed mouthpieces.