Image: Sumerian Tablet
Photograph of a Sumerian tablet from the Early Dynasty IIIa period (about 2600-2500 BCE) with the earliest written reference to a flute. This tablet is in the collection of the Vorderasiatisches Museum, Staatliche Museen zu Berlin, Germany, Museum #VAT 12617, CDLI No. P010663.
See the Cuneiform Digital Library Initiative, which has the full-resolution image. Thanks for the Vorderasiatisches Museum for permission to use this image.
See The Development of Flutes in Europe and Asia for more context about this image.