century. The instrument was adopted for the performance of orchestral and chamber music, opera and theater, wind ensembles (e.g., military and civic bands), and most other music which might be loosely described as relating to "Western classical music" (including, for example, jazz). Many further refinements have been made, and countless design variations are common among flutes today (the "offset G" key, addition of the low B foot, etc.) The concepts of the Boehm system have been applied across the range of flutes available, including piccolos, alto flutes, bass flutes, and so on, as well as other wind instruments. The material of the instrument may vary (many piccolos are made of wood, some very large flutes are wooden or even made of PVC). The flute is perhaps the oldest musical instrument, other than the human voice itself. There are very many flutes, both traversely blown and end-blown "fipple" flutes, currently produced which are not built on the Boehm model. The fingering system for the saxophone closely resembles the Boehm system. A key system inspired by Boehm's for the clarinet family is also known as the "Boehm system", although it was developed by Hyacinthe Klosé and not Boehm himself. The Boehm system was also adapted for a small number of flageolets. Boehm did work on a system for the bassoon, and Boehm-inspired oboes have been made, but non-Boehm systems remain predominant for these instruments. The Albert system is another key system for the clarinet. References Further reading (republication of third edition, 1967, as reprinted with corrections, 1977) External links Karl Ventzke, Boehm-System Bassoons in the 19th Century Flutes Clarinets Music performance Conceptual systems Musical performance techniques