Mazda MX-5/Miata current generation is about the same size (i think 5cm or so longer) as the original with modern safety features, it’s possible to keep the footprint small

You can buy single tracks/albums and download them without a subscription, the subscription is more a Spotify-like thing were you can listen to all songs but can’t download them without DRM

There’s also Jolla with Sailfish OS, but don’t know if they are any good

Just checked out Qobuz and you can even buy the music digitally to download (like bandcamp with the advantage that they are EU-based and seems like more artists are on Qobuz), think I’m going to switch