I've been using Windows Media Player for years (decades?), but have recently run into some issues with it and am looking for some alternatives.
I have a dedicated Win7 netbook hooked to my receiver and the big speakers in the living room, a couple of Win7 desktops with speakers upstairs, and the Win10 Surface Book in the kitchen, with everything networked. Up until now, I've kept the 120GB or so of MP3s on one of the desktops up stairs, but I'm averse to having that machine on 24/7, so there's also a copy of everything on the netbook downstairs that gets synched up whenever I get new music. The Surface Book only has a 256GB SSD so I really can't keep a full copy on that one...I'd certainly like to, since the Bluetooth headphones I got for Christmas work great with that machine. (The less said about my experiments with Bluetooth dongles on the other machines, the better.)
I recently added a Synology NAS with 8TB of storage. Since that runs 24/7, it's the obvious place to use as the master repository. But I absolutely hate the streaming apps that came with it, so for now I'm just mapping the 'Music' folder to an "M:" drive on every computer in the house, and telling WMP to get its music there. That works fine except that WMP doesn't seem happy with using playlists from machines that didn't create them: it keeps reporting that it can't find the song files, even though they clearly exist and can be played if selected individually or as albums.
I'm currently trying the Groove player on the Surface Book, waiting patiently for it to build its database from the NAS. Problem is, it won't run on the other (Win7) boxes.
Any suggestions for an alternative? Note that (1) it doesn't need to handle video and (2) I have zero desire to stream music off the internet.