The earliest known example of musical notation was carved in cuneiform onto a clay tablet in what is now Iraq.
It dates from about 1800 B.C.
The tablet represents instructions for performing music, and it was written using a diatonic scale, composed in harmonies of thirds.
A more developed form of notation can be found on a tablet from about 1250 B.C.
These tablets represent the earliest recorded melodies found anywhere in the world.