Bolero is in the public domain in Europe. Specific recordings are covered by a different law, as noted. It's possible the recordings are PD in Europe because of Life+70 laws. (Plus weird extensions. The owners/former owners of Bolero are fighting like the Doyle estate to keep it in their hands as long as possible.)
https://www.reddit.com/r/copyrightlaw/comments/mysehl/why_is_bolero_by_ravel_not...
https://www.techdirt.com/2016/05/04/copyright-holders-try-to-stop-ravels-bolero-...
Bolero was first recorded in 1928; it'll be a few years before that recording is public domain in the US.