Shazam

Shazam its one of my favourites apps for the mobile. 

Its a commercial mobile phone based in music identification service, its headquarters is in London.

If you want to know the name of the song you only have to put the phone near the song that is playing and wait just a little bit and if the song is found, 

the information of the artist, song title and the album appear in your phone. 

It's awesom because it finds almost all the songs!