 This led to articles in UK & Scottish dailies, including a short video demonstrating a prototype instrument of this type.To use a magnetic coil pickup, the bagpipe needs to be equipped with a reed or reeds made from a ferrous metal.As with a magnetic guitar pickup, the magnet in the pickup creates a magnetic field, which is then be disturbed by the oscillation (in this case of the metal reed, rather than the string), inducing a voltage in the coil.