Make collaborative playlists with your friends
If you dare let your guests DJ your next party, create a playlist, head to the options menu, and give your friends spare sets of keys by tapping "make collaborative." Then, anyone you pass the playlist link to can edit it.
Create folders for your playlists
If your ever-growing stock of playlists gets out of control like your tabs, head to the file menu on the desktop app, select "New Playlist Folder," and get organized.