Has your local radio station/s played unofficial singles? The 2 big ones in New Zealand have had these in their playlists:
Lady Gaga - Monster
Bruno Mars - Marry You, Runaway Baby
Nicki Minaj - Pound the Alarm (before official release)
Justin Bieber - All Around The World
B.o.B - Both Of Us (before official release)
There's alot more just can't think at the moment..
They've also played
Lady Gaga - Hair
Adele - Rumour Has It
Rihanna - Te Amo (before release)
And also Britney Spears - Radar and Rihanna - Rehab but then they started playing them a lot a long time after when they was officially released, except it had felt like i'd heard them somewhere else before
Azealia Banks - Rihanna - Marina and the Diamonds - Reece Mastin - Cher Lloyd - Lana Del Rey
Dance In The Dark came on z100 and was on their playlist for like a week. So was Scheisse, Government Hooker, and Heavy Metal Lover after IheartRadio's concert. I heard all 4 songs play before.
It was awesome.