I'm doing an A level physics project over the question 'Why is Brass the most common material used to make a trumpet?' and i have a few questions to put out there. Why is brass and copper resistant to corrosion? What is it about brass that gives it the right resonance to make the right sound and Is it the vibration of the lips, the air moving through the mouthpiece or a combination of the both that makes the sound? Thanks in advance for any replies! Sam.