There wasn't really any "great" way to share music without sharing headphones, or that portable speakers.
MyStream is the solution!
MyStream is a new application for the iPhone, which "pairs" with your friend's iPhone music list, to show your music.
Let's say you have a nice song you want your friend/friend's to listen to. Just share with MyStream! Everyone can now listen to the song on there own devices (a way for germs not to spread).
Also get 30 seconds to listen to a track on iTunes, before you decide to purchase it.