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This is the second stamp in a set of four issued in 2007 by Luxembourg. I haven't found any information on the organ, so would welcome any help there. This is from the second set of organ stamps from Luxembourg, issued to promote tourism.
This is the last in a set of four stamps issued in 2007. Promoting tourism, this is the second set of stamps Luxembourg has issued featuring church organs. The "Friends of the Organ" association has a helpful site that includes details about many instruments in the country. The present instrument is in the church of St. Joseph in Esch-sur-Alzette. Here is the page for this instrument built in 1977 by G. Westenfelder..jpg)

I have not been able to determine who the builder is, though the site says it is a German instrument.