I think this may belong to the Conoderus genus of click beetles. Adult click beetles feed on nectar, pollen, flowers, and sometimes soft-bodied insects like aphids. Click beetle larvae are mostly predators on small soil animals, but some eat roots and seeds. So your piano should be safe.
1,906,284 sightings of 21,341 species from 13,151 contributors CCA 3.0 | privacy
We acknowledge the Traditional Owners of this land and acknowledge their continuing connection to their culture. We pay our respects to their Elders past and present.