Seikilos epitaph
The Seikilos epitaph is the oldest surviving complete musical composition, including musical notation, from anywhere in the world. The epitaph has been variously dated, but seems to be either from the 1st or the 2nd century AD. The song, the melody of which is recorded, alongside its lyrics, in the ancient Greek musical notation, was found engraved on a tombstone (a stele) from the Hellenistic town Tralles near present-day Aydın, Turkey, not far from Ephesus. It is a Hellenistic Ionic song in either the Phrygian octave species or Iastian tonos. While older music with notation exists (for example the Hurrian songs), all of it is in fragments; the Seikilos epitaph is unique in that it is a complete, though short, composition.
John J. McClellan
John Jasper McClellan has made the oldest organ recording that we know today on the organ at the Mormon Tabernacle in Salt Lake City. It was recorded on or about 1 September 1910. Where the Columbia Graphophone Company had transported equipment to record the famous choir. Two enormous acoustic recording horns, five feet long and two feet wide, were suspended on a rope strung across the Tabernacle. Although the engineer deemed the recordings successful, apparently they were never approved for release.
Later, it can be heard on a 78 rpm plate from Columbia Recordings nr. 1704.
This according to “The first recordings of organ music ever made” by John W. Landon (Theatre organ: Journal of the American Theatre Organ Society LIII/4 [July–August 2011] pp. 22–28).