My guess is that it would be a drum, or other percussion instrument. They would have been very low tech and rudimentary.
The following quote from WikiPedia tends to reinforce my thoughts.
"Anthropologists and historians often speculate that percussion instruments were the first musical devices ever created. The human voice was probably the first musical instrument, but percussion instruments such as hands and feet, then sticks, rocks, and logs were almost certainly the next steps in the evolution of music.
The earliest percussion instruments were our hands and feet, then "found" objects such as sticks, logs, and hips. As human communities developed tools for hunting and eventually agriculture, their skill and technology enabled them to craft more complex instruments. For example, a simple log may have been carved to produce louder tones (a log drum) and instruments may have been combined to produce multiple tones (as in a 'set' of log drums)."
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Night came first because the Bible says that in the beginning it was all dark.
The game came out first, late in the year 2000. The movie came out after 3 remakes of the game, late in the year 2007.
Star Wars IV: A New Hope (the movie) came out in 1977 before any books were written. The movies came first.
the stupid hippie one.
He taught himself to play the drums at the age of about 2 years old.