stuck in my head

"Stay Awake", by London Grammar. I discovered this British trio through Spotify's recommendations, and am incredibly happy to have done so. They have a sound that I can only describe as alternative pop, with a mellow mix of soft piano and heaver, more electronic beats. Among the "also searched for" section are Lorde and  Florence and the Machine; while I don't think these artists are necessarily alike, their audiences are certainly prone to overlapping.