A bass recorder is a wind instrument in F3 that belongs to the family of recorders. The bass recorder plays an octave lower than the alto or treble recorder. In the recorder family it stands in between the tenor recorder and C great-bass (or quart-bass) recorder. Due to the length of the instrument, the lowest tone, F, requires a key. On modern instruments, keys may also be provided for low F♯, G, and G♯, and sometimes for C and C♯ as well.