As much as I love IDAGIO for classical music streaming, it is mostly solving the metadata problem for me. In other words, the issue of being able to sort and filter by time period, composer, conductor, etc.
I still find Apple Music's library for classical to be decent, and I already pay for it.
I am looking forward to trying out Concertino in the coming days.
Concertino - Classical music front-end for Apple Music
Transform Apple Music into a magical classical music jukebox - browse composers, genres and periods, create playlists of multi-movement works, start no-nonsense radio stations and much, much more, for free!