Composer	Title	Year	Pages & duration
O'Connell, Geoffrey	Prelude to a prayer-exercise	1981
O'Donnell, John (1948-)	Fanfare, variations & fugue on "Aainsi que la buche rée"	1998	18p. 15m.
Olive, Vivienne (1950-)	This one for J. P.: A meditation on a short prelude by J. Pachelbel	1983	11p. 5m.
O'Neill, Lindsay (1924-2002)	Hymn preludes	c. 1970
Owens, Ian S.	Prelude and fugue (to J. V. P.)	1965	10p.