Actually, I’m gonna add another really simple option: Lyrion (Formerly Logitech Media Server). My wife swears by this one, supports local library, integrates with LastFM, and if you use Tidal, Qobuz, Deezer, or Spotify, you can integrate your streaming service with your local library for radio mixes.

Can install it right on a laptop or PC and connect to wherever your music is (local on the machine, on a NAS, etc.). After you install it, you can access it directly via a web browser or webapp, which will make it accessible from desktop or phone.

Not necessarily overkill, you can run Plex on almost anything. I used to run it on an old NUC6 I had laying around, then upgraded to a NUC8, and more recently I setup it up as a VM on Proxmox on a Ryzen 5700u mini-PC and just reimported the DB.

Virtualizing it has been good for my purposes since now it’s running alongside AssetUPnP, AudioBookshelf, and a dockerized squeezelite setup, and I’ve another VM on the host running Home Assistant with still plenty of resources to spare. Crazy we can do that now with a “server” that literally fits in my palm.

But virtualizing it makes hardware acceleration for video transcode be I more complicated, just a heads up. I play everything native so don’t use it, but YMMV.

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Edit - Plexamp is an awesome radio/DJ player, though I generally send to a Wiim Mini, as AirPlay quality with Plexamp can be kind of ass compared to direct DLNA.

There are lots of solutions, but as others have noted, Plex with Plexamp is great.

I’d recommend getting a NAS for storage and running mirrored disks. This way you’ve got some redundancy in the event of a disk failure.

I spend a bunch of time in log reviews in my current role. “Googling the error message” image is literally hanging on my office wall.

You’re not likely to do that for $150. You might be able to pull an old Dell Precision T5500 tower with a weak Xeon on eBay for cheap and refit it with more ram, better CPU and cheap non-redundant storage for $200 - $250.

For sake of power requirements though, seriously consider your use case and needs. You can get by pretty well with cheap mini-PCs like Intel NUCs or AMD minis like Beelink for pretty cheap and just cluster them with something like Proxmox to scale out instead of up when you need additional resources. This will be reasonably priced and keep the power bill and noise levels down.

If you have Plex pass there’s a built in auto leveling setting, but it’s not available on the free version.

Alternately foobar2000 or other tools can apply replaygain but you’ll need a tender that will actually use it. I use Asset UPnP.