The ivory flute (and art in general) should be up there.
After decades of claiming that the extinction of the Neanderthals was their relative stupidity compared to us, scientists now believe that the Neanderthals were actually more adept at creating effective tools than us, and roughly as smart.
The reason we're now purported to have survived over them was our ability to socially network and form communities in a way the Neanderthals never did. One of the ways we formed bonds in this way was through the trade/gifting of art and musical instruments, ancient relics of which which can be scattered over vast distances all over Europe.
It seems our love of art (and community) has helped us survive one of the greatest challenges our race has ever faced.