The pedal harp was invented during the 1800s by a man in France. This is the kind of harp that is heard in most classical music and is used in the modern symphony orchestra, and for this reason it is often called a concert harp. Pedal harps are about two meters tall and have about 50 strings. The lowest and highest notes on a pedal harp are the same as the lowest and highest notes on a piano. They are very heavy, and need more than one person to move them. The frame is usually made out of metal.