What are you trying to ask? Like the style ?
Hello, for a goodbye letter tell them what you enjoyed about their class, how they impacted you, and if you’re going to remember anything in particular about them. just be grateful and say thank you and that you will miss them.
Trumpets at this time horns as a general term appeared in earliest as forms of battle communication. These horns had not valves or button and could only produce root pitches. The valves added an extension to the instruments note capabilities however the construction of the piping has stayed mostly the same with the length of tubing associated with the pitch or key to which it is played in