 It is a similar shape and size to the C key, but runs along the front of the flute and is placed next to the G key and is also operated by the little finger of the left hand.F is an uncommon note in traditional music for the five-key flute, but where it appears the short F key is sometimes awkward to play.The keys of the 19th-century five-key D flute include an E key, F key, G key and either a C key or a long left hand additional F key.