4. An instrument as claimed in claim 3 further comprising a display screen comprises symbols representing different rhythmic measures of speech.
4. An instrument as claimed in claim 3 further comprising a display screen comprises symbols representing different rhythmic measures of speech. 14. An instrument as claimed in claim 4 comprising a storage device for storing the input signals and a recall device operable to provide a visual and/or an aural representation of input rhythm by reference to the stored input signals.