Here you can find some links to other pages, concerts, youtube etc:
Homepage Matthias Müller: www.matthiasmüller.org
Homepage Rühlmannorgan Festival: www.rühlmannorgel.de (also with harmonium concerts)
Homepage Camino Santiago: www.elcaminomusical.info
Homepage Festival Bourgogne: www.festimusical.com (also with harmonium concerts)
Youtube videos with Harmonium:
Schumann: Manfred: https://youtu.be/kvNQID7maw0
Clavierfestival Hundisburg on television: https://youtu.be/cgL5InvCm34
Festimusical on television: https://youtu.be/YSBvsZR47vA
Friends since 30 years!!! ( Last "impro" on end of Festival 2012): https://youtu.be/SwLQhcFhRx0
Emma Ashford: O sanctissima: https://www.youtube.com/watch?v=kRvUhNnmmEk
Cesar Franck: Vieux Noel : https://www.youtube.com/watch?v=JzXnASv_v98