A slow and soft Adagio by Georg (1653-1704) OR his son Gottlieb Muffat (1690-1770). That's a mystery to me ... Who can tell me???
Info about father: http://en.wikipedia.org/wiki/Georg_Muffat
and son: http://en.wikipedia.org/wiki/Gottlieb_Muffat
I think it's a lovely piece, like a 'priere' or 'Gebet'.
Played on the Schnitger organ at Zwolle, with all the (4) 8-foot flutes coupled for a nice chorus effect.
I hope you'll like it!