Startup Idea : Share Music Instantly

You are at a Party, the music is really cool and you ask the person who is putting the song: What's the title? or Can you send it to me? I will never send it too you, because both of you won't remember which song was it (alcohol?). The idea of having an App that should be installed on both devices. And when you bump the two phones (if geolocalisation is the same + accept transfer) the title of the song is sent to the other phone with a link to buy the song on iTunes, a link to listen to it on youtube or soundcloud. What do you think?