Maurerische Trauermusik KV 477

The "Maurerische Trauermusik" (Masonic Funeral Music) certainly is one of the highlights in Mozart's music. He not only combines contrapuntal techniques, but it is one of his rarely composed cantus-firmus pieces. You'll find a Gregorian choral in long notes in it, which origin is unclear. It is assumed that it is a choral related to the fremasons - as the music was composed for the death of two of their members.