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.
Rossi Codex
The Rossi Codex is a music manuscript collection of the 14th century. The manuscript is presently divided into two sections, one in the Vatican Library and another, smaller section in the Northern Italian town of Ostiglia. The codex contains 37 secular works including madrigals, cacce and, uniquely among trecento sources, monophonic ballatas. The codex is of great interest for trecento musicologists because for many years it was considered the earliest source of fourteenth-century Italian music. Although other pre-1380 sources of secular, polyphonic, Italian music have now been identified, none are nearly so extensive as the Rossi Codex.