Discovered them when "Latch" became big around the beginning of 2014, I think. Listened to the entire album several times and fell in love. With was such nice, refreshing take on the increasingly stuffy edm scene. Made it even better to see that they were so young and so talented. And now their new singles building up to their new album haven't slowed down at all and I'm still singing along hours after listening.
EDIT: Also their newest song is really addicting, Holding On feat. Gregory Porter.