Flageolet tones, harmonics or overtones are produced by touching the string gently with the tip of your finger and in this case, with harp, plucking the string softly, producing a tone one octave above in pitch.
The term also applies with the string group (violin, viola, cello, double bass) where it is produced in the same manner as with harp, except you now have the choice of pizzicato or arco. Bowing the harp is unfortunately impossible [img]images/icons/smile.gif[/img]
Be aware when writing harmonics for harps or plucked strings in general as they can be hard to produce with a consistent quality of tone. Harmonic glissandis are impossible on harp and so are fast passages. I\'m sure there are exceptional players with robotic technique who can produce perfect overtones at high speed but these guys are probably few and far between! [img]images/icons/smile.gif[/img]