To be honest, song file sizes are of least concern in the age of hdd drives that are multi-TB for $100. I can easily store lossless formats and then use playlists to convert to a more portable format.

What I really need is a way to be notified of releases from bands I want to track, and rate songs that I both do and do not own so I know what to ignore or investigate further. Of course this needs to be via something I myself can optionally own/manage, not just through a third party that will enshittify.