Yes, when you click the music button you can see your music in playlists down the left side (depends on whether 'songs' or 'playlists' was selected from the top centre screen), but the main screen only seems to show what's in a selected playlist (unless 'music' button was selected). I can't see that it's possible to view your entire music library in the main screen and see all your playlists on the left (as you used to be able to do).
Now, it's quite possible that i've missed something obvious, so please let me know if i'm missing something here.
Just re-read the above and it sounds confusing even to me
Cheers
Jem