Re: Most of the 'casualties' are Ballmer era stuff
Groove had the essential functionality of being able to stream your own music files from OneDrive. As more and more underground bands either delay the release of their albums on streaming services or just keep them at BandCamp only all together, Spotify is pretty useless for me.
I switched to Google Play, which has somewhat similar approach, but instead of managing your own files you upload them to Google, which performs some matching algorithm which fails quite a lot. MS Groove was much superior in that regard.
Biting the hand that feeds IT
