Each program limitation.
MyMusicCloud -> limit playing only 250 songs.
Beat - cloud & music -> no song downloading in advance to play offline later. But you can play from cache.
Cloudaround
- limit only 1 cloud account.
- can't move downloaded songs to SD card (only Android6).
- Onedrive can't be downloaded (mean no offline play).
CloudBeats -> download function need to be upgraded.
CloudPlayer -> only premium account can play cloud music files.
AirBeats -> support only Dropbox.