Simplify the following text for a Grade 8 native English-speaking person.
Original: The earliest form of musical notation can be found in a cuneiform tablet that was created at Nippur , Iraq in about 2000 B.C. .
Simplified: The earliest kind of musical notation was written on tablets using a way of writing called cuneiform . Music from Nippur from about 2000 B.C. has been found which seems to give an approximate idea of how the music should be played .