aktor, you're right, a random selection won't stay the same all day, but here is a partial solution.
For an auto-playlist selecting a whole album at random, see this post:
https://getmusicbee.com/forum/index.php?topic=37755.msg207199#msg207199However, since the auto-playlist's content will change each time you re-open it, you have 2 possible workarounds.
- Manually save the auto-playlist's content to a static playlist.
- Or, in the auto-playlist edit window, tick option "automatically export a static copy" (lower left corner).
That static copy will only be overwritten if you re-open the auto-playlist edit window and hit "Save".
The location of static copies is defined in: Preferences -> tab "Library" -> section "playlists" - > option "exported playlists".
Otherwise, a fully automated selection as you wish is not possible in the current state of MusicBee. It would require the ability to set the "random seed" to the value matching "today at 0:00".