You know what's weird? I filled in "Carousel" as sounds like well before I remembered that Day Wave is actually a member of the band.
That indicates two things: 1) I've clearly got a bad memory; 2) I'm really good at "Sounds Like" sections.
"Headcase" comes as the final track of Day Wave's new EP by the same name: Headcase. It's streaming now on SoundCloud and, having picked up nearly 2 million plays in aggregate, clearly deserves a listen.