Whether you mean to or not, you’ll almost inevitably work in a particular key when writing a song. You might decide “right, this will be in C minor,” or you might just string together a seemingly ...

This article was updated May 5, 2023. It was originally published Sept. 24, 2009. Shaft keys—sometimes called sunk keys—transmit torque between shafts and shaft-mounted components such as gears or ...