I have decided to change this post although I can not change the name of it. I guess my question as a new trumpet player is why does my trumpet not want to be played sometimes. I do play outside so I thought it was form taking the instrument form the warm indoors to the cool fall outdoors. After the trumpet was left outside for awhile it played better. With no warm up or nothing. I did oil the vavles and snake the bell end and lead pipe end before I left it outside. I thought that was what the problem was even though the valve were not sticking and air could pass through the trumpet.