Although we have mentioned only trumpets in the title this lecture is really about all the wind instruments, including the pipe organ. One of the main considerations will be the way in which the actual technology involved in making instruments has affected the whole course of musical development. The early trumpets without valves could play tunes with only very high notes; the development of valves has, however, made it possible to play tunes at a much lower pitch. On the early woodwind instruments it was quite difficult to play very rapid passages but the introduction of Boehm's marvellous system of keys has made the instruments much more flexible. The opening clarinet glissando of the "Rhapsody in Blue" would be very difficult on a baroque instrument!