together with his bagatelles, expected on Chandos sometime this month (https://www.naxos.com/CatalogueDetail/?id=CHAN20304). (Not ultra-obscure, but not standard rep yet either, especially the first sonata.)'
(Actually, Presto (https://www.prestomusic.com/classical/products/9694506--busoni-violin-sonatas) has it out already, as of Friday.)