John Keys has produced a very extensive range of CDs of organ hymn accompaniments and voluntaries, in association with the bestselling popular science writer Brian Clegg .

Brian Clegg
All of the following are available from the Church Music Site, www.hymncds.com , Tel. 00 44 1793 791393:
Popular Traditional Hymns for All Seasons, a set of 138 organ hymn accompaniments on 6 CDs in a presentation case
More Hymns, a further 49 well-known hymns on a 2-CD set
Christmas Organ Accompaniments, a CD containing 21 carol organ accompaniments for congregations and choirs
More Christmas Organ Accompaniments, consisting of 27 further carol accompaniment CD tracks
Organ Music for Remembrance Day, including several National Anthems, The Last Post and Reveille, and 20 hymns
Organ Music for Weddings, a 2-CD set containing 14 organ pieces and 37 hymn accompaniments for weddings
Wedding Pieces for Organ, 22 organ pieces by well-known composers, which are suitable for weddings
US Anglican Hymn Supplement is a set of 4 discs containing almost 100 hymns altogether. These have been produced in association with, and under the guidance of Anglican Bishop Joel Marcus Johnson of The Chesapeake, Maryland, USA

Bishop Joel Marcus Johnson at St Andrew-the-Seafarer, Easton, Maryland
Alternative Hymn Tunes (US) Volume 1, 2, 3 and 4 contains hymns, many of which are specific to the American Baptist tradition
Catholic Organ Hymn Accompaniments consists of 25 Catholic hymn tunes
French and German Organ Music, a CD of organ pieces
Bach Miniatures, a CD consisting of short pieces by J.S.Bach
Finally, there are two CDs of piano recordings, consisting of 35 Worship Songs and 44 Junior Worship Songs, respectively.
Individual tracks can also be ordered from the full list given on the Church Music Site.
Click on the links to hear some sample tracks:
Johann Sebastian Bach (1685-1750): Toccata in d BWV 565
Louis Lefébure-Wély (1817-1869): Sortie en mi bémol majeur
Franz Joseph Haydn (1732-1809): Flötenuhr No. 23 in C
Vivaldi/ arr. Johann Sebastian Bach (1685-1750): Largo e spiccato (Concerto in d BWV 596)
The Marcussen organ at St Mary's, Nottingham