Conductors

Generally speaking, orchestra conductors wear tailcoats at concerts.

They say metal boxes are great heat conductors.

Good conductors of heat are usually good conductors of electricity, but that puts the causal relation backwards. Conduction-band electrons can't help but transport kinetic energy, which--randomized--is heat. Putting heat before electricity is reasonable only because of the rarity of materials like diamond that conduct heat via the quasi-particles called phonons, which are communicable crystal-lattice vibrations.

City buses used to have conductors who sat to the left of the entrance and sold you tickets.

There used to be conductors on town buses who would sit to the left of the entrance, selling tickets to passengers.

La Maestra is an international competition for women conductors.

In the past there were conductors on town buses who would sit to the left of the doorway selling tickets to passengers.

Korea fans may like the dissertation "A Study of Korean Diction for Choral Conductors Using the Principles of the Korean Writing System."

Transistors are made of solid materials such as silicon or germanium whose electrical properties lie somewhere between conductors and insulators: they are semiconductors.