If the performer doesn't mind and the work is public domain then it's an easy path
For example, here's the famous Waldstein by Beethoven performed explicitly as a free and open recording
https://commons.m.wikimedia.org/wiki/File:Ludwig_van_Beethov...
Funny apocryphal story about that song. For a long time I had got in my head that was extremely disruptive for the time. I envisioned men with powdered wigs running distressfully throughout the aisles as he plays the work for the first time as their wives fan themselves and couch faint in the seats.
I still think that every time I hear it and I think it's hilarious to imagine European high society losing their composure over this sonata. This and Brandenburg Concerto No. 3 are ridiculously close to modern music structure. That's a 110bpm breakbeat done with violins you're hearing.
https://www.gardnermuseum.org/experience/music
These are recordings of live performances by a variety of musicians from a long lasting podcast series.
Licence
https://www.gardnermuseum.org/organization/rights-reproducti...
and scroll down.
https://musopen.org/music/performer/isabella-stewart-gardner...
I've just discovered that the ISGM library has been uploaded to musopen.org which is good as the ISGM Web page has a pretty basic search function.
I could be wrong about this, but aren’t individual performances of these works still protected? If I record an album of works by Debussy that performance isn’t in the public domain and couldn’t be used as sample tracks.