@ritchey_de @stroughtonsmith How about Doppler? They also have a Mac and a "Transfer" app. https://brushedtype.co/doppler/
It uses the Apple design language but it's pretty basic. For a more feature-complete solution, there is Plexamp, though this requires setting up a Plex server. https://www.plex.tv/plexamp/
brushedtype.coDoppler Music Player for Mac and iPhoneDoppler is a powerful music player that makes owning music simpler