Here are some useful links to...

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...cathedral choirs / church choirs

• St George's Church Hanover Square, London
  
• St Woolos Cathedral Choir
• Exeter Cathedral Choirs
• Guildford Cathedral Choir
• Bristol Cathedral Choir
• Regensburger Domspatzen
• Knabenchor Niederaltaich
• Schottenchor Regensburg

...organisations / music colleges  /  universities

• English Cathedral Music
• Royal College of Organists
• Royal School of Church Music
• Guild of Church Musicians
• Musica Sacra (ACV)
• Royal College of Music, London
• Royal Academy of Music, London
• Birmingham Conservatoire
  
• Hochschule für Kirchenmusik, Regensburg
• King's College School, Wimbledon
  

...people

• Stephen Farr (Organist, Guildford Cathedral, UK)
• Franz Walden (Catholic Priest, Nordendorf, Germany)
• Harry Krippner (Visual Artist, Germany)
• Martin Völlinger (Organist and Choirmaster, Gospic Cathedral, Croatia)
• Wolfram Graf (Composer and Organist, Hof, Germany)
• Dominik Herrmann (Opera Bass Singer, Frankfurt a.M., Germany)
• Prof Dr Stefan Kloeckner (Specialist in Gregorian Chant, Germany)
• Mark Swinton (Assistant Organist, Bath Abbey)