The Epic Of Gilgamesh is the earliest great works of literature that we know of, and was first written down by the Sumerians around 2100 BC.
What you hear in this video are a few of the opening lines of part of the epic poem, accompanied only by a long-neck, three-string, Sumerian lute known as a "gish-gu-di".
The instrument is tuned to G - G - D, and although it is similar to other long neck lutes still in use today (the tar, the setar, the saz, etc.) the modern instruments are low tension and strung with fine steel wire. The ancient long neck lutes (such as the Egyptian "nefer") were strung with gut and behaved slightly differently. The short-neck lute known as the "oud" is strung with gut/nylon, and its sound has much in common with the ancient long-neck lute although the oud is not a fretted instrument and its strings are much shorter (about 25 inches or 63cm) as compared to 32 inches (82cm) on a long-neck instrument.
The location for this performance is the courtyard of Nebuchadnezzar's palace in Babylon. The piece is four minutes long and is intended only as a taste of what the music of ancient Sumer might have sounded like.