Lithophones might be some of the oldest musical instruments. There are traces from the Upper Palaeolithic (Solutrean period, approx. 22,000β17,000 years ago*) that suggest the musical use of rocks. The video posted here includes a boulder with a remarkable bell-like sound.
Here is footage of another example from Sudan:
This is a snippet from “Lost Kingdoms of Africa: Nubia”
*Referring to the Nerja cave:
“The cave of Nerja contains at least 19 paintings so far reported, and has excellent acoustics, such that it is now sometimes used as a venue for concerts and dance in the summer months. It also contains a feature known as βthe organβ, which consists of an area in an alcove where the calcareous deposits have formed into a fluted, concertina-like feature. […] the style of the ibex and hind illustrated suggest a Solutrean (c.22-17 Kya) age for the illustrations […]” https://www.darwin.cam.ac.uk/wp-content/uploads/2024/11/dcrr002.pdf -> Page 70 (page 82 in the PDF)