Thank you, Sojar Voglar! I studied the Hindemith's Sonata for trumpet and Piano in my Graduation in composition, I think this piece influence me too much to compose this sonatina. Do you have some piece for trumpet and piano? If, yes, I would like to listen. Abraço!
At the very bottom of the webpage (you may have to minimize the chat bar), you will see "Theme", right next to the "Contact Us" link. Click on "Theme", and a popup box should appear. You can choose the Blue Theme, in which you can then start testing the JPlayer to see if that fixes the issues with Safari.
What instrument do you play?
The best way to determine is if you are able to sing the line.
Are you asking about a single note? Or are you asking about continuously playing in general? Register and dynamic play a huge role in the answer.
As a general rule, if you can sing it, a player can play it. Yes there are differences between instruments. As stated, oboists need to learn to exhale before inhaling lest they hyperventilate (a big problem for younger players!). What level are you trying to write for? Young players will expend air faster than an advanced player.
Talk to some players of the instruments if you're not sure. Take a trumpet player to coffee and he will probably tell you a lot of what you need to know.
Perhaps you can post what you want them to be able to do, and someone can tell you if it's doable.