Today I thought we’d take a metallurgical tour of the orchestra. The bars, for example, of glockenspiels and celestas are made of steel. So are some of the strings of stringed instruments, and almost all strings are wound with very fine wire made of steel, silver, or aluminum. The bodies of timpani are made of copper, and brass instruments are made of… well, brass, which is an alloy of copper and zinc. French horns, though, may also be made of nickel silver, an alloy of copper, zinc, and nickel, or nickel brass, an alloy of copper, tin, and nickel.