Flutes made from the wing bones of the California Condor
Many Paleo types seem to think something like heavy metal is Paleo. For me, personally, primal music is Native American flute and drum music. The oldest clearly identified musical instrument, besides the human voice, is, in fact, a flute, dating back around 43,000 years ago. Hard to make heavy metal on flutes.
Almost as old is the first known drum, from 37,000 years ago. Drumming certainly goes further back than 37,000 years though, because other species do drum rhythmically. You certainly can make warlike music on drums. You can also use them for other functions such as communicating over long distances and going into ritual trances, or just for fun.
I like relaxing music, like this.