Maybe I'm the only one, but there are certain songs that make me want to throw things the moment they start playing. Currently, it's "All About That Bass" and it's everywhere. I'd love a way to block or hide that %^&* song so I don't have to continually hear it in otherwise great playlists.
Just a temporary (or not) blacklist. You have the ability to do this, at least on a global scale. I've come across many tracks that "aren't available at this time" and grayed out.
This would especially be helpful in the Radio section.