"Hanging On" starts off with some lovely vocals (it is Ellie Goulding, after all) set against a deep, dark electronic soundscape. Just wait till you get 1:20 in, where everything perfectly melds together, cascading down into a liquid pool of deliciousness. Talk about ear meltingly good.
Tinie Tempah shows up halfway through, at 2:50. I wasn't really into the duet; Ellie could have easily carried that song by herself. But, I will say that it gives the song somewhat of an edge, and probably more mass appeal.
This song dropped less than 5 hours ago, and has already received thousands (43,000+) of listens on SoundCloud (the site even crashed for a little while as people clamored to be the first to hear it.) Must be because she tweeted, "Here's the beginning of my new journey. Enjoy and share responsibly."