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.
Nabnitu
Nabnitu ("Creation") is an ancient encyclopedic work of the Old Babylonian period ("circa" 1800 BCE) that consists of multiple tablets. Its Tablet XXXII (often called as U.3011) is a Sumerian-Akkadian text from Ur, and notable as one of the oldest extant documented examples of musical notation. Although on its own the tablet is somewhat cryptic, analysis of other ancient Babylonian texts reveals that it describes the nine strings of an unidentified instrument and its intervals. The nine strings, numbered symmetrically as 123454321, are presented in two parallel columns, one in Sumerian and the other in Akkadian. Tablet XXXII is now in the collections of the British Museum.