Just tossing in my own recommendation: I use Lyrion Music Server (previously Logitech Media Server (previously Slim Devices/Squeezebox))[1]

It's open-source, self-hosted, has various good plugins (eg: I have some Pandora stations I listen to, as well as my own music collection). You can synchronize music across multiple devices in your home (I just have 2).

Even though the physical devices (Squeezebox Touch, etc) are no longer sold, it's pretty easy to build one yourself with a raspberry pi.

It's one of those cases where a company created something great, and strongly-open-sourced it enough that the project can't die even though the new owners are not giving it the love it deserves.

So, I hope to keep using it for the rest of my days (:

[1] https://lyrion.org/