Jon Caramanica: Rihanna and Chris Brown Appear on Each Other’s Songs (NYTimes.com)
‘If the songs were dull or disposable, they’d still be important, but they might matter less. But they’re both good, “Birthday Cake” very much so. The quality matters because they’re likely to lodge themselves in the public consciousness and seep onto radio playlists: this mess won’t just melt into the air.’