After following one of the advertising links on the site for Starline Brass I came across this video. Its a good a take on how brass is formed, check it out!
[video=youtube_share;74ssMmD_tXE]http://youtu.be/74ssMmD_tXE[/video]
[video=youtube_share;74ssMmD_tXE]http://youtu.be/74ssMmD_tXE[/video]