What was first song?

The Hurrian Songs (sometimes called the Hurrian Cult Hymnody or the Hurrian sacred chants) are a collection of four extant songs in Hurrian, along with one Sumerian hymn, transcribed into cuneiform in the 14th century BC and discovered at the ancient city of Ugarit in what is now Syria. The most famous song from this collection is the song known as the Hurrian Cult Hymn number 6, also known as the Hymn to Nikkal.

Dating to around 1450 BC, it is the oldest "notated melodies to have survived to the modern era".