Pedal (music)
On pipe organs there is a pedalboard with pedals which play notes in the same way that the fingers are playing notes.  An organ pedalboard usually has two and a half octaves of notes.  These are low notes written in the bass clef.  An organist has to learn to play with the feet at the same time as with the hands.  He uses the toes or the heels of his shoes.  It is even possible to play four notes at once (four part chords) but this is very difficult and usually found in some modern French music.