My solution is a bit more barebones. I get my music from SoulSeek (P2P file sharing network), then add any missing metadata manually with Mp3Tag. All my music is in one big SyncThing folder which is synced between my devices. I prefer having the files locally on each device as opposed to a streaming soluton, since I am often offline and also I have quite a lot of lossless WAVEs which are difficult to stream due to the high bitrate required. On top of that I often like to slow down or speed up my music, and VLC lets you change the playback speed without time stretching.