Superproducer Mike WiLL just saved himself from a total bummer of week — seriously, who thought this was a good idea? — with the release of “Syrup in My Soda.” You knew it was only a matter of time before two of rap’s most fascinating eccentrics linked up, but the outrageous beauty that stems from Riff Raff and iLoveMakonnen on this cut ascends like the beat’s spaceship synths. Really, this song is just so joyful, I don’t know how it could be about downers, you know? And, perhaps, its best quality is how totally unhinged Makonnen’s crooning becomes — he wants to do this more than most people want to do anything at all. When he purrs, “I don’t want to hear your shit / About who got next / We out here toastin’ to it” and launches into a full Orbisonian quiver? Forget it. Go home, all other songs. This is the only one.