In an unexpected move, Adam Lambert dropped a new song on iTunes this morning. Lambert's third studio album The Original High is out on June 17th, and this new offering is showing off the genius Max Martin and Shellback have in store for us.

'Underground' follows in the apocalyptic vibe of 'Ghost Town', however this one is a hypnotic power ballad. The song sees Adam sweetly singing over an excellently crafted R&B beat that is a perfect marriage of his previous sounds.

Lambert has referred to this song as "one of the key tracks" on the album, and it's not hard to see why. This may very well be one of the best songs he's ever released. It sounds like nothing on radio at the moment but could easily slide in and become a hit.

Adam Lambert's third studio album, The Original High, will be released on June 17th.